add JavaScript codes for Tree

codes/javascript/chapter_tree/binary_tree.js

@@ -0,0 +1,34 @@
+/**
+ * File: binary_tree.js
+ * Created Time: 2022-12-04
+ * Author: IsChristina (christinaxia77@foxmail.com)
+ */
+
+const Tree = require("../include/TreeNode");
+ 
+/* 初始化二叉树 */
+// 初始化结点
+let n1 = new Tree.TreeNode(1),
+n2 = new Tree.TreeNode(2),
+n3 = new Tree.TreeNode(3),
+n4 = new Tree.TreeNode(4),
+n5 = new Tree.TreeNode(5);
+// 构建引用指向（即指针）
+n1.left = n2;
+n1.right = n3;
+n2.left = n4;
+n2.right = n5;
+console.log("\n初始化二叉树\n")
+console.log(n1)
+
+/* 插入与删除结点 */
+let P = new Tree.TreeNode(0);
+// 在 n1 -> n2 中间插入结点 P
+n1.left = P;
+P.left = n2;
+console.log("\n插入结点 P 后\n");
+console.log(n1);
+// 删除结点 P
+n1.left = n2;
+console.log("\n删除结点 P 后\n");
+console.log(n1);