mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-05 05:53:45 +00:00
2139 lines
69 KiB
HTML
2139 lines
69 KiB
HTML
<!DOCTYPE HTML>
|
|
<html lang="zh-tw" >
|
|
|
|
<head>
|
|
|
|
<meta charset="UTF-8">
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
|
|
<title>方法聲明 | Go编程语言</title>
|
|
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
|
<meta name="description" content="">
|
|
<meta name="generator" content="GitBook 2.5.2">
|
|
|
|
|
|
<meta name="HandheldFriendly" content="true"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
|
|
<meta name="apple-mobile-web-app-capable" content="yes">
|
|
<meta name="apple-mobile-web-app-status-bar-style" content="black">
|
|
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
|
|
<link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">
|
|
|
|
<link rel="stylesheet" href="../gitbook/style.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-highlight/website.css">
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-search/search.css">
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../gitbook/plugins/gitbook-plugin-fontsettings/website.css">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<link rel="next" href="../ch6/ch6-02.html" />
|
|
|
|
|
|
<link rel="prev" href="../ch6/ch6.html" />
|
|
|
|
|
|
|
|
</head>
|
|
<body>
|
|
|
|
|
|
<div class="book" data-level="6.1" data-chapter-title="方法聲明" data-filepath="ch6/ch6-01.md" data-basepath=".." data-revision="Mon Dec 21 2015 12:51:02 GMT+0800 (中国标准时间)">
|
|
|
|
|
|
<div class="book-summary">
|
|
<nav role="navigation">
|
|
<ul class="summary">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="chapter " data-level="0" data-path="index.html">
|
|
|
|
|
|
<a href="../index.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
前言
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="0.1" data-path="ch0/ch0-01.html">
|
|
|
|
|
|
<a href="../ch0/ch0-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>0.1.</b>
|
|
|
|
Go語言起源
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="0.2" data-path="ch0/ch0-02.html">
|
|
|
|
|
|
<a href="../ch0/ch0-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>0.2.</b>
|
|
|
|
Go語言項目
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="0.3" data-path="ch0/ch0-03.html">
|
|
|
|
|
|
<a href="../ch0/ch0-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>0.3.</b>
|
|
|
|
本書的組織
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="0.4" data-path="ch0/ch0-04.html">
|
|
|
|
|
|
<a href="../ch0/ch0-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>0.4.</b>
|
|
|
|
更多的信息
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="0.5" data-path="ch0/ch0-05.html">
|
|
|
|
|
|
<a href="../ch0/ch0-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>0.5.</b>
|
|
|
|
致謝
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1" data-path="ch1/ch1.html">
|
|
|
|
|
|
<a href="../ch1/ch1.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.</b>
|
|
|
|
入門
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="1.1" data-path="ch1/ch1-01.html">
|
|
|
|
|
|
<a href="../ch1/ch1-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.1.</b>
|
|
|
|
Hello, World
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.2" data-path="ch1/ch1-02.html">
|
|
|
|
|
|
<a href="../ch1/ch1-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.2.</b>
|
|
|
|
命令行參數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.3" data-path="ch1/ch1-03.html">
|
|
|
|
|
|
<a href="../ch1/ch1-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.3.</b>
|
|
|
|
査找重複的行
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.4" data-path="ch1/ch1-04.html">
|
|
|
|
|
|
<a href="../ch1/ch1-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.4.</b>
|
|
|
|
GIF動畵
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.5" data-path="ch1/ch1-05.html">
|
|
|
|
|
|
<a href="../ch1/ch1-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.5.</b>
|
|
|
|
穫取URL
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.6" data-path="ch1/ch1-06.html">
|
|
|
|
|
|
<a href="../ch1/ch1-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.6.</b>
|
|
|
|
併發穫取多個URL
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.7" data-path="ch1/ch1-07.html">
|
|
|
|
|
|
<a href="../ch1/ch1-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.7.</b>
|
|
|
|
Web服務
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.8" data-path="ch1/ch1-08.html">
|
|
|
|
|
|
<a href="../ch1/ch1-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>1.8.</b>
|
|
|
|
本章要點
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2" data-path="ch2/ch2.html">
|
|
|
|
|
|
<a href="../ch2/ch2.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.</b>
|
|
|
|
程序結構
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="2.1" data-path="ch2/ch2-01.html">
|
|
|
|
|
|
<a href="../ch2/ch2-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.1.</b>
|
|
|
|
命名
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.2" data-path="ch2/ch2-02.html">
|
|
|
|
|
|
<a href="../ch2/ch2-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.2.</b>
|
|
|
|
聲明
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.3" data-path="ch2/ch2-03.html">
|
|
|
|
|
|
<a href="../ch2/ch2-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.3.</b>
|
|
|
|
變量
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.4" data-path="ch2/ch2-04.html">
|
|
|
|
|
|
<a href="../ch2/ch2-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.4.</b>
|
|
|
|
賦值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.5" data-path="ch2/ch2-05.html">
|
|
|
|
|
|
<a href="../ch2/ch2-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.5.</b>
|
|
|
|
類型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.6" data-path="ch2/ch2-06.html">
|
|
|
|
|
|
<a href="../ch2/ch2-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.6.</b>
|
|
|
|
包和文件
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.7" data-path="ch2/ch2-07.html">
|
|
|
|
|
|
<a href="../ch2/ch2-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>2.7.</b>
|
|
|
|
作用域
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3" data-path="ch3/ch3.html">
|
|
|
|
|
|
<a href="../ch3/ch3.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.</b>
|
|
|
|
基礎數據類型
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="3.1" data-path="ch3/ch3-01.html">
|
|
|
|
|
|
<a href="../ch3/ch3-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.1.</b>
|
|
|
|
整型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3.2" data-path="ch3/ch3-02.html">
|
|
|
|
|
|
<a href="../ch3/ch3-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.2.</b>
|
|
|
|
浮點數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3.3" data-path="ch3/ch3-03.html">
|
|
|
|
|
|
<a href="../ch3/ch3-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.3.</b>
|
|
|
|
複數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3.4" data-path="ch3/ch3-04.html">
|
|
|
|
|
|
<a href="../ch3/ch3-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.4.</b>
|
|
|
|
布爾型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3.5" data-path="ch3/ch3-05.html">
|
|
|
|
|
|
<a href="../ch3/ch3-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.5.</b>
|
|
|
|
字符串
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="3.6" data-path="ch3/ch3-06.html">
|
|
|
|
|
|
<a href="../ch3/ch3-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>3.6.</b>
|
|
|
|
常量
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4" data-path="ch4/ch4.html">
|
|
|
|
|
|
<a href="../ch4/ch4.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.</b>
|
|
|
|
複合數據類型
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.1" data-path="ch4/ch4-01.html">
|
|
|
|
|
|
<a href="../ch4/ch4-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.1.</b>
|
|
|
|
數組
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.2" data-path="ch4/ch4-02.html">
|
|
|
|
|
|
<a href="../ch4/ch4-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.2.</b>
|
|
|
|
切片
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.3" data-path="ch4/ch4-03.html">
|
|
|
|
|
|
<a href="../ch4/ch4-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.3.</b>
|
|
|
|
字典
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.4" data-path="ch4/ch4-04.html">
|
|
|
|
|
|
<a href="../ch4/ch4-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.4.</b>
|
|
|
|
結構體
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="ch4/ch4-05.html">
|
|
|
|
|
|
<a href="../ch4/ch4-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.5.</b>
|
|
|
|
JSON
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="ch4/ch4-06.html">
|
|
|
|
|
|
<a href="../ch4/ch4-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>4.6.</b>
|
|
|
|
文本和HTML模闆
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5" data-path="ch5/ch5.html">
|
|
|
|
|
|
<a href="../ch5/ch5.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.</b>
|
|
|
|
函數
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="ch5/ch5-01.html">
|
|
|
|
|
|
<a href="../ch5/ch5-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.1.</b>
|
|
|
|
函數聲明
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="ch5/ch5-02.html">
|
|
|
|
|
|
<a href="../ch5/ch5-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.2.</b>
|
|
|
|
遞歸
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="ch5/ch5-03.html">
|
|
|
|
|
|
<a href="../ch5/ch5-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.3.</b>
|
|
|
|
多返迴值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="ch5/ch5-04.html">
|
|
|
|
|
|
<a href="../ch5/ch5-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.4.</b>
|
|
|
|
錯誤
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.5" data-path="ch5/ch5-05.html">
|
|
|
|
|
|
<a href="../ch5/ch5-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.5.</b>
|
|
|
|
函數值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.6" data-path="ch5/ch5-06.html">
|
|
|
|
|
|
<a href="../ch5/ch5-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.6.</b>
|
|
|
|
匿名函數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.7" data-path="ch5/ch5-07.html">
|
|
|
|
|
|
<a href="../ch5/ch5-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.7.</b>
|
|
|
|
可變參數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.8" data-path="ch5/ch5-08.html">
|
|
|
|
|
|
<a href="../ch5/ch5-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.8.</b>
|
|
|
|
Deferred函數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.9" data-path="ch5/ch5-09.html">
|
|
|
|
|
|
<a href="../ch5/ch5-09.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.9.</b>
|
|
|
|
Panic異常
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.10" data-path="ch5/ch5-10.html">
|
|
|
|
|
|
<a href="../ch5/ch5-10.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>5.10.</b>
|
|
|
|
Recover捕穫異常
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6" data-path="ch6/ch6.html">
|
|
|
|
|
|
<a href="../ch6/ch6.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.</b>
|
|
|
|
方法
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter active" data-level="6.1" data-path="ch6/ch6-01.html">
|
|
|
|
|
|
<a href="../ch6/ch6-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.1.</b>
|
|
|
|
方法聲明
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6.2" data-path="ch6/ch6-02.html">
|
|
|
|
|
|
<a href="../ch6/ch6-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.2.</b>
|
|
|
|
基於指針對象的方法
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6.3" data-path="ch6/ch6-03.html">
|
|
|
|
|
|
<a href="../ch6/ch6-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.3.</b>
|
|
|
|
通過嵌入結構體來擴展類型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6.4" data-path="ch6/ch6-04.html">
|
|
|
|
|
|
<a href="../ch6/ch6-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.4.</b>
|
|
|
|
方法值和方法表達式
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6.5" data-path="ch6/ch6-05.html">
|
|
|
|
|
|
<a href="../ch6/ch6-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.5.</b>
|
|
|
|
示例: Bit數組
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="6.6" data-path="ch6/ch6-06.html">
|
|
|
|
|
|
<a href="../ch6/ch6-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>6.6.</b>
|
|
|
|
封裝
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7" data-path="ch7/ch7.html">
|
|
|
|
|
|
<a href="../ch7/ch7.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.</b>
|
|
|
|
接口
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="7.1" data-path="ch7/ch7-01.html">
|
|
|
|
|
|
<a href="../ch7/ch7-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.1.</b>
|
|
|
|
接口是合約
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.2" data-path="ch7/ch7-02.html">
|
|
|
|
|
|
<a href="../ch7/ch7-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.2.</b>
|
|
|
|
接口類型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.3" data-path="ch7/ch7-03.html">
|
|
|
|
|
|
<a href="../ch7/ch7-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.3.</b>
|
|
|
|
實現接口的條件
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.4" data-path="ch7/ch7-04.html">
|
|
|
|
|
|
<a href="../ch7/ch7-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.4.</b>
|
|
|
|
flag.Value接口
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.5" data-path="ch7/ch7-05.html">
|
|
|
|
|
|
<a href="../ch7/ch7-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.5.</b>
|
|
|
|
接口值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.6" data-path="ch7/ch7-06.html">
|
|
|
|
|
|
<a href="../ch7/ch7-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.6.</b>
|
|
|
|
sort.Interface接口
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.7" data-path="ch7/ch7-07.html">
|
|
|
|
|
|
<a href="../ch7/ch7-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.7.</b>
|
|
|
|
http.Handler接口
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.8" data-path="ch7/ch7-08.html">
|
|
|
|
|
|
<a href="../ch7/ch7-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.8.</b>
|
|
|
|
error接口
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.9" data-path="ch7/ch7-09.html">
|
|
|
|
|
|
<a href="../ch7/ch7-09.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.9.</b>
|
|
|
|
示例: 表達式求值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.10" data-path="ch7/ch7-10.html">
|
|
|
|
|
|
<a href="../ch7/ch7-10.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.10.</b>
|
|
|
|
類型斷言
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.11" data-path="ch7/ch7-11.html">
|
|
|
|
|
|
<a href="../ch7/ch7-11.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.11.</b>
|
|
|
|
基於類型斷言識别錯誤類型
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.12" data-path="ch7/ch7-12.html">
|
|
|
|
|
|
<a href="../ch7/ch7-12.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.12.</b>
|
|
|
|
通過類型斷言査詢接口
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.13" data-path="ch7/ch7-13.html">
|
|
|
|
|
|
<a href="../ch7/ch7-13.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.13.</b>
|
|
|
|
類型分支
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.14" data-path="ch7/ch7-14.html">
|
|
|
|
|
|
<a href="../ch7/ch7-14.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.14.</b>
|
|
|
|
示例: 基於標記的XML解碼
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.15" data-path="ch7/ch7-15.html">
|
|
|
|
|
|
<a href="../ch7/ch7-15.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>7.15.</b>
|
|
|
|
補充幾點
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8" data-path="ch8/ch8.html">
|
|
|
|
|
|
<a href="../ch8/ch8.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.</b>
|
|
|
|
Goroutines和Channels
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="8.1" data-path="ch8/ch8-01.html">
|
|
|
|
|
|
<a href="../ch8/ch8-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.1.</b>
|
|
|
|
Goroutines
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.2" data-path="ch8/ch8-02.html">
|
|
|
|
|
|
<a href="../ch8/ch8-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.2.</b>
|
|
|
|
示例: 併發的Clock服務
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.3" data-path="ch8/ch8-03.html">
|
|
|
|
|
|
<a href="../ch8/ch8-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.3.</b>
|
|
|
|
示例: 併發的Echo服務
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.4" data-path="ch8/ch8-04.html">
|
|
|
|
|
|
<a href="../ch8/ch8-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.4.</b>
|
|
|
|
Channels
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.5" data-path="ch8/ch8-05.html">
|
|
|
|
|
|
<a href="../ch8/ch8-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.5.</b>
|
|
|
|
併行的循環
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.6" data-path="ch8/ch8-06.html">
|
|
|
|
|
|
<a href="../ch8/ch8-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.6.</b>
|
|
|
|
示例: 併發的Web爬蟲
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.7" data-path="ch8/ch8-07.html">
|
|
|
|
|
|
<a href="../ch8/ch8-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.7.</b>
|
|
|
|
基於select的多路複用
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.8" data-path="ch8/ch8-08.html">
|
|
|
|
|
|
<a href="../ch8/ch8-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.8.</b>
|
|
|
|
示例: 併發的字典遍歷
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.9" data-path="ch8/ch8-09.html">
|
|
|
|
|
|
<a href="../ch8/ch8-09.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.9.</b>
|
|
|
|
併發的退齣
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="8.10" data-path="ch8/ch8-10.html">
|
|
|
|
|
|
<a href="../ch8/ch8-10.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>8.10.</b>
|
|
|
|
示例: 聊天服務
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9" data-path="ch9/ch9.html">
|
|
|
|
|
|
<a href="../ch9/ch9.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.</b>
|
|
|
|
基於共享變量的併發
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="9.1" data-path="ch9/ch9-01.html">
|
|
|
|
|
|
<a href="../ch9/ch9-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.1.</b>
|
|
|
|
競爭條件
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.2" data-path="ch9/ch9-02.html">
|
|
|
|
|
|
<a href="../ch9/ch9-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.2.</b>
|
|
|
|
sync.Mutex互斥鎖
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.3" data-path="ch9/ch9-03.html">
|
|
|
|
|
|
<a href="../ch9/ch9-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.3.</b>
|
|
|
|
sync.RWMutex讀寫鎖
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.4" data-path="ch9/ch9-04.html">
|
|
|
|
|
|
<a href="../ch9/ch9-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.4.</b>
|
|
|
|
內存同步
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.5" data-path="ch9/ch9-05.html">
|
|
|
|
|
|
<a href="../ch9/ch9-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.5.</b>
|
|
|
|
sync.Once初始化
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.6" data-path="ch9/ch9-06.html">
|
|
|
|
|
|
<a href="../ch9/ch9-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.6.</b>
|
|
|
|
競爭條件檢測
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.7" data-path="ch9/ch9-07.html">
|
|
|
|
|
|
<a href="../ch9/ch9-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.7.</b>
|
|
|
|
示例: 併發的非阻塞緩存
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="9.8" data-path="ch9/ch9-08.html">
|
|
|
|
|
|
<a href="../ch9/ch9-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>9.8.</b>
|
|
|
|
Goroutines和線程
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10" data-path="ch10/ch10.html">
|
|
|
|
|
|
<a href="../ch10/ch10.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.</b>
|
|
|
|
包和工具
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="10.1" data-path="ch10/ch10-01.html">
|
|
|
|
|
|
<a href="../ch10/ch10-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.1.</b>
|
|
|
|
簡介
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.2" data-path="ch10/ch10-02.html">
|
|
|
|
|
|
<a href="../ch10/ch10-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.2.</b>
|
|
|
|
導入路徑
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.3" data-path="ch10/ch10-03.html">
|
|
|
|
|
|
<a href="../ch10/ch10-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.3.</b>
|
|
|
|
包聲明
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.4" data-path="ch10/ch10-04.html">
|
|
|
|
|
|
<a href="../ch10/ch10-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.4.</b>
|
|
|
|
導入聲明
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.5" data-path="ch10/ch10-05.html">
|
|
|
|
|
|
<a href="../ch10/ch10-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.5.</b>
|
|
|
|
匿名導入
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.6" data-path="ch10/ch10-06.html">
|
|
|
|
|
|
<a href="../ch10/ch10-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.6.</b>
|
|
|
|
包和命名
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="10.7" data-path="ch10/ch10-07.html">
|
|
|
|
|
|
<a href="../ch10/ch10-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>10.7.</b>
|
|
|
|
工具
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11" data-path="ch11/ch11.html">
|
|
|
|
|
|
<a href="../ch11/ch11.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.</b>
|
|
|
|
測試
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="11.1" data-path="ch11/ch11-01.html">
|
|
|
|
|
|
<a href="../ch11/ch11-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.1.</b>
|
|
|
|
go test
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11.2" data-path="ch11/ch11-02.html">
|
|
|
|
|
|
<a href="../ch11/ch11-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.2.</b>
|
|
|
|
測試函數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11.3" data-path="ch11/ch11-03.html">
|
|
|
|
|
|
<a href="../ch11/ch11-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.3.</b>
|
|
|
|
測試覆蓋率
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11.4" data-path="ch11/ch11-04.html">
|
|
|
|
|
|
<a href="../ch11/ch11-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.4.</b>
|
|
|
|
基準測試
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11.5" data-path="ch11/ch11-05.html">
|
|
|
|
|
|
<a href="../ch11/ch11-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.5.</b>
|
|
|
|
剖析
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="11.6" data-path="ch11/ch11-06.html">
|
|
|
|
|
|
<a href="../ch11/ch11-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>11.6.</b>
|
|
|
|
示例函數
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12" data-path="ch12/ch12.html">
|
|
|
|
|
|
<a href="../ch12/ch12.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.</b>
|
|
|
|
反射
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="12.1" data-path="ch12/ch12-01.html">
|
|
|
|
|
|
<a href="../ch12/ch12-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.1.</b>
|
|
|
|
爲何需要反射?
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.2" data-path="ch12/ch12-02.html">
|
|
|
|
|
|
<a href="../ch12/ch12-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.2.</b>
|
|
|
|
reflect.Type和reflect.Value
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.3" data-path="ch12/ch12-03.html">
|
|
|
|
|
|
<a href="../ch12/ch12-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.3.</b>
|
|
|
|
Display遞歸打印
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.4" data-path="ch12/ch12-04.html">
|
|
|
|
|
|
<a href="../ch12/ch12-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.4.</b>
|
|
|
|
示例: 編碼S表達式
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.5" data-path="ch12/ch12-05.html">
|
|
|
|
|
|
<a href="../ch12/ch12-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.5.</b>
|
|
|
|
通過reflect.Value脩改值
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.6" data-path="ch12/ch12-06.html">
|
|
|
|
|
|
<a href="../ch12/ch12-06.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.6.</b>
|
|
|
|
示例: 解碼S表達式
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.7" data-path="ch12/ch12-07.html">
|
|
|
|
|
|
<a href="../ch12/ch12-07.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.7.</b>
|
|
|
|
穫取結構體字段標識
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.8" data-path="ch12/ch12-08.html">
|
|
|
|
|
|
<a href="../ch12/ch12-08.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.8.</b>
|
|
|
|
顯示一個類型的方法集
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="12.9" data-path="ch12/ch12-09.html">
|
|
|
|
|
|
<a href="../ch12/ch12-09.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>12.9.</b>
|
|
|
|
幾點忠告
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="13" data-path="ch13/ch13.html">
|
|
|
|
|
|
<a href="../ch13/ch13.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.</b>
|
|
|
|
底層編程
|
|
</a>
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="13.1" data-path="ch13/ch13-01.html">
|
|
|
|
|
|
<a href="../ch13/ch13-01.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.1.</b>
|
|
|
|
unsafe.Sizeof, Alignof 和 Offsetof
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="13.2" data-path="ch13/ch13-02.html">
|
|
|
|
|
|
<a href="../ch13/ch13-02.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.2.</b>
|
|
|
|
unsafe.Pointer
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="13.3" data-path="ch13/ch13-03.html">
|
|
|
|
|
|
<a href="../ch13/ch13-03.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.3.</b>
|
|
|
|
示例: 深度相等判斷
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="13.4" data-path="ch13/ch13-04.html">
|
|
|
|
|
|
<a href="../ch13/ch13-04.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.4.</b>
|
|
|
|
通過cgo調用C代碼
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="13.5" data-path="ch13/ch13-05.html">
|
|
|
|
|
|
<a href="../ch13/ch13-05.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>13.5.</b>
|
|
|
|
幾點忠告
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="14" data-path="errata.html">
|
|
|
|
|
|
<a href="../errata.html">
|
|
|
|
<i class="fa fa-check"></i>
|
|
|
|
<b>14.</b>
|
|
|
|
勘誤
|
|
</a>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="divider"></li>
|
|
<li>
|
|
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
|
|
本書使用 GitBook 釋出
|
|
</a>
|
|
</li>
|
|
|
|
</ul>
|
|
</nav>
|
|
</div>
|
|
|
|
<div class="book-body">
|
|
<div class="body-inner">
|
|
<div class="book-header" role="navigation">
|
|
<!-- Actions Left -->
|
|
|
|
|
|
<!-- Title -->
|
|
<h1>
|
|
<i class="fa fa-circle-o-notch fa-spin"></i>
|
|
<a href="../" >Go编程语言</a>
|
|
</h1>
|
|
</div>
|
|
|
|
<div class="page-wrapper" tabindex="-1" role="main">
|
|
<div class="page-inner">
|
|
|
|
|
|
<section class="normal" id="section-">
|
|
|
|
<h2 id="61-方法聲明">6.1. 方法聲明</h2>
|
|
<p>在函數聲明時,在其名字之前放上一個變量,卽是一個方法。這個附加的參數會將該函數附加到這種類型上,卽相當於爲這種類型定義了一個獨占的方法。</p>
|
|
<p>下面來寫我們第一個方法的例子,這個例子在package geometry下:</p>
|
|
<pre><code class="lang-go">gopl.io/ch6/geometry
|
|
<span class="hljs-keyword">package</span> geometry
|
|
|
|
<span class="hljs-keyword">import</span> <span class="hljs-string">"math"</span>
|
|
|
|
<span class="hljs-keyword">type</span> Point <span class="hljs-keyword">struct</span>{ X, Y <span class="hljs-typename">float64</span> }
|
|
|
|
<span class="hljs-comment">// traditional function</span>
|
|
<span class="hljs-keyword">func</span> Distance(p, q Point) <span class="hljs-typename">float64</span> {
|
|
<span class="hljs-keyword">return</span> math.Hypot(q.X-p.X, q.Y-p.Y)
|
|
}
|
|
|
|
|
|
<span class="hljs-comment">// same thing, but as a method of the Point type</span>
|
|
<span class="hljs-keyword">func</span> (p Point) Distance(q Point) <span class="hljs-typename">float64</span> {
|
|
<span class="hljs-keyword">return</span> math.Hypot(q.X-p.X, q.Y-p.Y)
|
|
}
|
|
</code></pre>
|
|
<p>上面的代碼里那個附加的參數p,叫做方法的接收器(receiver),早期的面向對象語言留下的遺産將調用一個方法稱爲“向一個對象發送消息”。</p>
|
|
<p>在Go語言中,我們併不會像其它語言那樣用this或者self作爲接收器;我們可以任意的選擇接收器的名字。由於接收器的名字經常會被使用到,所以保持其在方法間傳遞時的一致性和簡短性是不錯的主意。這里的建議是可以使用其類型的第一個字母,比如這里使用了Point的首字母p。</p>
|
|
<p>在方法調用過程中,接收器參數一般會在方法名之前齣現。這和方法聲明是一樣的,都是接收器參數在方法名字之前。下面是例子:</p>
|
|
<pre><code class="lang-Go">p := Point{<span class="hljs-number">1</span>, <span class="hljs-number">2</span>}
|
|
q := Point{<span class="hljs-number">4</span>, <span class="hljs-number">6</span>}
|
|
fmt.Println(Distance(p, q)) <span class="hljs-comment">// "5", function call</span>
|
|
fmt.Println(p.Distance(q)) <span class="hljs-comment">// "5", method call</span>
|
|
</code></pre>
|
|
<p>可以看到,上面的兩個函數調用都是Distance,但是卻沒有發生衝突。第一個Distance的調用實際上用的是包級别的函數geometry.Distance,而第二個則是使用剛剛聲明的Point,調用的是Point類下聲明的Point.Distance方法。</p>
|
|
<p>這種p.Distance的表達式叫做選擇器,因爲他會選擇合適的對應p這個對象的Distance方法來執行。選擇器也會被用來選擇一個struct類型的字段,比如p.X。由於方法和字段都是在同一命名空間,所以如果我們在這里聲明一個X方法的話,編譯器會報錯,因爲在調用p.X時會有歧義(譯註:這里確實挺奇怪的)。</p>
|
|
<p>因爲每種類型都有其方法的命名空間,我們在用Distance這個名字的時候,不同的Distance調用指向了不同類型里的Distance方法。讓我們來定義一個Path類型,這個Path代表一個線段的集合,併且也給這個Path定義一個叫Distance的方法。</p>
|
|
<pre><code class="lang-Go"><span class="hljs-comment">// A Path is a journey connecting the points with straight lines.</span>
|
|
<span class="hljs-keyword">type</span> Path []Point
|
|
<span class="hljs-comment">// Distance returns the distance traveled along the path.</span>
|
|
<span class="hljs-keyword">func</span> (path Path) Distance() <span class="hljs-typename">float64</span> {
|
|
sum := <span class="hljs-number">0.0</span>
|
|
<span class="hljs-keyword">for</span> i := <span class="hljs-keyword">range</span> path {
|
|
<span class="hljs-keyword">if</span> i > <span class="hljs-number">0</span> {
|
|
sum += path[i-<span class="hljs-number">1</span>].Distance(path[i])
|
|
}
|
|
}
|
|
<span class="hljs-keyword">return</span> sum
|
|
}
|
|
</code></pre>
|
|
<p>Path是一個命名的slice類型,而不是Point那樣的struct類型,然而我們依然可以爲它定義方法。在能夠給任意類型定義方法這一點上,Go和很多其它的面向對象的語言不太一樣。因此在Go語言里,我們爲一些簡單的數值、字符串、slice、map來定義一些附加行爲很方便。方法可以被聲明到任意類型,隻要不是一個指針或者一個interface。</p>
|
|
<p>兩個Distance方法有不同的類型。他們兩個方法之間沒有任何關繫,盡管Path的Distance方法會在內部調用Point.Distance方法來計算每個連接鄰接點的線段的長度。</p>
|
|
<p>讓我們來調用一個新方法,計算三角形的週長:</p>
|
|
<pre><code class="lang-Go">perim := Path{
|
|
{<span class="hljs-number">1</span>, <span class="hljs-number">1</span>},
|
|
{<span class="hljs-number">5</span>, <span class="hljs-number">1</span>},
|
|
{<span class="hljs-number">5</span>, <span class="hljs-number">4</span>},
|
|
{<span class="hljs-number">1</span>, <span class="hljs-number">1</span>},
|
|
}
|
|
fmt.Println(perim.Distance()) <span class="hljs-comment">// "12"</span>
|
|
</code></pre>
|
|
<p>在上面兩個對Distance名字的方法的調用中,編譯器會根據方法的名字以及接收器來決定具體調用的是哪一個函數。第一個例子中path[i-1]數組中的類型是Point,因此Point.Distance這個方法被調用;在第二個例子中perim的類型是Path,因此Distance調用的是Path.Distance。</p>
|
|
<p>對於一個給定的類型,其內部的方法都必鬚有唯一的方法名,但是不同的類型卻可以有同樣的方法名,比如我們這里Point和Path就都有Distance這個名字的方法;所以我們沒有必要非在方法名之前加類型名來消除歧義,比如PathDistance。這里我們已經看到了方法比之函數的一些好處:方法名可以簡短。當我們在包外調用的時候這種好處就會被放大,因爲我們可以使用這個短名字,而可以省略掉包的名字,下面是例子:</p>
|
|
<pre><code class="lang-Go"><span class="hljs-keyword">import</span> <span class="hljs-string">"gopl.io/ch6/geometry"</span>
|
|
|
|
perim := geometry.Path{{<span class="hljs-number">1</span>, <span class="hljs-number">1</span>}, {<span class="hljs-number">5</span>, <span class="hljs-number">1</span>}, {<span class="hljs-number">5</span>, <span class="hljs-number">4</span>}, {<span class="hljs-number">1</span>, <span class="hljs-number">1</span>}}
|
|
fmt.Println(geometry.PathDistance(perim)) <span class="hljs-comment">// "12", standalone function</span>
|
|
fmt.Println(perim.Distance()) <span class="hljs-comment">// "12", method of geometry.Path</span>
|
|
</code></pre>
|
|
<p>譯註:如果我們要用方法去計算perim的distance,還需要去寫全geometry的包名,和其函數名,但是因爲Path這個變量定義了一個可以直接用的Distance方法,所以我們可以直接寫perim.Distance()。相當於可以少打很多字,作者應該是這個意思。因爲在Go里包外調用函數需要帶上包名,還是挺麻煩的。</p>
|
|
|
|
|
|
</section>
|
|
|
|
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<a href="../ch6/ch6.html" class="navigation navigation-prev " aria-label="Previous page: 方法"><i class="fa fa-angle-left"></i></a>
|
|
|
|
|
|
<a href="../ch6/ch6-02.html" class="navigation navigation-next " aria-label="Next page: 基於指針對象的方法"><i class="fa fa-angle-right"></i></a>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<script src="../gitbook/app.js"></script>
|
|
|
|
|
|
<script src="../gitbook/plugins/gitbook-plugin-search/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/plugins/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/plugins/gitbook-plugin-sharing/buttons.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/plugins/gitbook-plugin-fontsettings/buttons.js"></script>
|
|
|
|
|
|
<script>
|
|
require(["gitbook"], function(gitbook) {
|
|
var config = {"highlight":{},"search":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2}};
|
|
gitbook.start(config);
|
|
});
|
|
</script>
|
|
|
|
|
|
</body>
|
|
|
|
</html>
|