递归书写树形图示例

news2024/10/6 14:26:41

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

<!DOCTYPE html>
<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>
</html>