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ch5-10 fmt code

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D 2016-01-11 23:44:13 +08:00
parent 5c288d0893
commit 45b04fc567
1 changed files with 10 additions and 10 deletions
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ch5/ch5-10.md
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@ -35,15 +35,15 @@ deferred函數幫助Parse從panic中恢複。在deferred函數內部，panic val
func soleTitle(doc *html.Node) (title string, err error) {
type bailout struct{}
defer func() {
switch p := recover(); p {
case nil:
// no panic
case bailout{}:
// "expected" panic
err = fmt.Errorf("multiple title elements")
default:
panic(p) // unexpected panic; carry on panicking
}
switch p := recover(); p {
case nil:
// no panic
case bailout{}:
// "expected" panic
err = fmt.Errorf("multiple title elements")
default:
panic(p) // unexpected panic; carry on panicking
}
}()
// Bail out of recursion if we find more than one nonempty title.
forEachNode(doc, func(n *html.Node) {
@ -65,4 +65,4 @@ func soleTitle(doc *html.Node) (title string, err error) {
有些情況下，我們無法恢複。某些致命錯誤會導致Go在運行時終止程序，如內存不足。
**練習5.19：** 使用panic和recover編寫一個不包含return語句但能返迴一個非零值的函數。
**練習5.19：** 使用panic和recover編寫一個不包含return語句但能返迴一個非零值的函數。