数组数据
var list = [
{id:1,pid:0,name:‘一级‘},
{id:2,pid:1,name:‘一级1‘},
{id:3,pid:1,name:‘一级2‘},
{id:4,pid:2,name:‘一级1-1‘}
]
核心代码：
// 数组转tree
function composeTree(list = []) { const data = JSON.parse(JSON.stringify(list)) // 浅拷贝不改变源数据 const result = [] if (!Array.isArray(data)) { return result } data.forEach(item => { delete item.children }) const map = {} data.forEach(item => { map[item.id] = item }) data.forEach(item => { const parent = map[item.pid] if (parent) { (parent.children || (parent.children = [])).push(item) } else { result.push(item) } }) return result }
调用方法：
let tree = composeTree(list)
console.log(tree) // [{"id":1,"pid":0,"name":"一级","children":[{"id":2,"pid":1,"name":"一级1","children":[{"id":4,"pid":2,"name":"一级1-1"}]},{"id":3,"pid":1,"name":"一级2"}]}]
原文：https://www.cnblogs.com/na-w/p/11136825.html