js 递归思路构造树型结构数据

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原创 2023-04-17 18:35:15 1.1k 阅读 AI 写同款· GEO 优化 ›

鸿蒙应用启动时长优化：五阶段拆解与精准治理启动时长是移动应用性能的核心指标，其本质是系统加载、初始化、调度与渲染的端到端链路耗时。在鸿蒙（HarmonyOS）中，启动过程被明确定义为AppLoad、AppInit、AbilityCreate、AbilityForeground和UIRender五大原子阶段，每个阶段均受资源策略、配置元数据、生命周期设计及ArkUI渲染机制深度影响。区别于Android以onResume为终点的测量逻辑，鸿蒙以首帧像素绘制（VSync触发）为完成标志，要求开发者必须借助hdc命令与hiTraceMeter进行毫秒级归阅读详情

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
 
</body>
<script>
  function create_tree(data,pid){
	pid = pid || 0;
	var list = [];
	data.map(function(item){
		if(item.pid == pid){
			item.children = create_tree(data,item.id);
			list.push(item);
		}
	});

	return list;
}
var db = [
	{id: 1, name: 'nama1', pid: 0},
	{id: 2, name: 'nama2', pid: 1},
	{id: 3, name: 'nama3', pid: 2},
	{id: 5, name: 'nama5', pid: 2},
	{id: 4, name: 'nama4', pid: 0},
	{id: 6, name: 'nama6', pid: 1110}
];


var aa = create_tree(db);
console.log(aa);
</script>
</html>