递归书写树形图示例

本文主要是介绍递归书写树形图示例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

大叫好，今天书写了一个扁型转换为树型的例子，使用的是递归，请大家食用，无毒

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<html lang="zh"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>树结构</title></head><body><script>let arr = [{id: 1,name: "中国",pid: 0}, {id: 78,name: "美国",pid: 0}, {id: 2,name: "河南",pid: 1}, {id: 3,name: "河北",pid: 1}, {id: 4,name: "新乡",pid: 2}, {id: 5,name: "开封",pid: 2}, {id: 6,name: "许昌",pid: 2}, {id: 7,name: "漯河",pid: 2}, {id: 8,name: "石家庄",pid: 3}, {id: 9,name: "邢台",pid: 3}, {id: 10,name: "秦皇岛",pid: 3}, {id: 11,name: "衡水",pid: 3}, {id: 12,name: "延津县",pid: 4}, {id: 13,name: "封丘县",pid: 4}, {id: 14,name: "长垣县",pid: 4}, {id: 15,name: "王楼镇",pid: 12}, {id: 16,name: "牛屯镇",pid: 12}, {id: 17,name: "王屯镇",pid: 12}, {id: 18,name: "刘庄乡",pid: 15}, {id: 19,name: "王庄乡",pid: 15}, {id: 20,name: "陈庄乡",pid: 15}, {id: 21,name: "娄庄乡",pid: 15}, {id: 22,name: "张庄乡",pid: 15}, {id: 23,name: "李庄乡",pid: 15}, {id: 24,name: "草庄乡",pid: 15}, {id: 25,name: "刘庄村",pid: 18}, {id: 26,name: "王庄村",pid: 18}, {id: 27,name: "李庄村",pid: 18}, {id: 28,name: "和庄村",pid: 18}];// 递归函数构建树结构function buildTree(arr, pid) {let result = [];for (let i = 0; i < arr.length; i++) {if (arr[i].pid === pid) {let children = buildTree(arr, arr[i].id);if (children.length) {arr[i].children = children;}result.push(arr[i]);}}return result;}// 构建树结构let tree = buildTree(arr, 0);console.log(tree);</script></body>
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