Update JavaScript and TypeScript codes for all chapters, rename JavaScript and TypeScript import folder to modules (#402)

* Update JavaScript and TypeScript codes

* Rename JavaScript and TypeScript import folder to modules

codes/javascript/modules/TreeNode.js

@@ -0,0 +1,54 @@
+/**
+ * File: TreeNode.js
+ * Created Time: 2022-12-04
+ * Author: IsChristina (christinaxia77@foxmail.com)
+ */
+
+/**
+ * Definition for a binary tree node.
+ */
+class TreeNode {
+    val; // 结点值
+    left; // 左子结点指针
+    right; // 右子结点指针
+    height; //结点高度
+    constructor(val, left, right, height) {
+        this.val = val === undefined ? 0 : val;
+        this.left = left === undefined ? null : left;
+        this.right = right === undefined ? null : right;
+        this.height = height === undefined ? 0 : height;
+    }
+}
+
+/**
+ * Generate a binary tree given an array
+ * @param arr
+ * @return
+ */
+function arrToTree(arr) {
+    if (arr.length === 0) return null;
+
+    let root = new TreeNode(arr[0]);
+    let queue = [root];
+    let i = 0;
+    while (queue.length) {
+        let node = queue.shift();
+        if (++i >= arr.length) break;
+        if (arr[i] !== null) {
+            node.left = new TreeNode(arr[i]);
+            queue.push(node.left);
+        }
+        if (++i >= arr.length) break;
+        if (arr[i] !== null) {
+            node.right = new TreeNode(arr[i]);
+            queue.push(node.right);
+        }
+    }
+
+    return root;
+}
+
+module.exports = {
+    TreeNode,
+    arrToTree
+};