diff --git a/liuyuhao.html b/liuyuhao.html
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+
+
+
+
+
+ Document
+
+
+
+
+
+
+
+
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diff --git a/liuyuhao.js b/liuyuhao.js
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+const cityData = [
+ {
+ parentValue: 1,
+ value: 11,
+ label: '北京市',
+ },
+ {
+ parentValue: 11,
+ value: 111,
+ label: '东城区'
+ },
+ {
+ parentValue: 11,
+ value: 112,
+ label: '西城区'
+ },
+ {
+ parentValue: 1,
+ value: 12,
+ label: '上海市',
+ },
+ {
+ parentValue: 12,
+ value: 121,
+ label: '黄浦区'
+ },
+ {
+ parentValue: 12,
+ value: 122,
+ label: '徐汇区'
+ },
+ {
+ parentValue: 1,
+ value: 13,
+ label: '广东省',
+ },
+ {
+ parentValue: 13,
+ value: 131,
+ label: '广州市',
+ },
+ {
+ parentValue: 131,
+ value: 1311,
+ label: '天河区'
+ },
+ {
+ parentValue: 131,
+ value: 1312,
+ label: '越秀区'
+ },
+ {
+ parentValue: 132,
+ value: 1321,
+ label: '南山区'
+ },
+ {
+ parentValue: 132,
+ value: 1322,
+ label: '罗湖区'
+ },
+ {
+ value: 1,
+ label: '中国',
+ },
+ {
+ parentValue: 13,
+ value: 132,
+ label: '深圳市',
+ }
+]
+
+/* *
+ 1.请利用递归方法实现一个函数，把上方数据递归成有层级的数据，
+ 2.把value字段变成id字段，label字段变成title字段，children字段变成child字段，
+ 3.去掉parentValue字段，最终得到以下数据。需要一模一样的数据
+ ⚠️注意：不允许使用三层循环，请使用递归方法
+ [
+ {
+ id: 1,
+ title: '中国',
+ child: [
+ {
+ id: 11,
+ title: '北京市',
+ child: [
+ {
+ id: 111,
+ title: '东城区'
+ },
+ {
+ id: 112,
+ title: '西城区'
+ }
+ ]
+ },
+ {
+ id: 12,
+ title: '上海市',
+ child: [
+ {
+ id: 121,
+ title: '黄浦区'
+ },
+ {
+ id: 122,
+ title: '徐汇区'
+ }
+ ]
+ },
+ {
+ id: 13,
+ title: '广东省',
+ child: [
+ {
+ id: 131,
+ title: '广州市',
+ child: [
+ {
+ id: 1311,
+ title: '天河区'
+ },
+ {
+ id: 1312,
+ title: '越秀区'
+ }
+ ]
+ },
+ {
+ id: 132,
+ title: '深圳市',
+ child: [
+ {
+ id: 1321,
+ title: '南山区'
+ },
+ {
+ id: 1322,
+ title: '罗湖区'
+ }
+ ]
+ }
+ ]
+ }
+ ]
+ }
+]
+ * */
+
+
+// 具体实现
+const getArea = (data) => {
+ const build = (parentValue) => {
+ return data
+ .filter(item => item.parentValue === parentValue)
+ .map(item => {
+ const node = {
+ id: item.value,
+ title: item.label
+ };
+ const children = build(item.value);
+ if (children.length > 0) {
+ node.child = children;
+ }
+ return node;
+ });
+ };
+ result.push(...build(undefined));
+}
+
+const result = [];
+getArea(cityData);
+console.log(result);
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+ 
+ 
+