let listToTree = (list, id = 'id', pId = 'pId') => {    let map = {},        listMap = {},        rootList = [];    for (let i = 0, max = list.length; i < max; i++) {        let one = Object.assign({}, list[i]);        map[one[id]] = one;        if (listMap[one[id]]) {            one.children = listMap[one[id]];        }        if (one.hasOwnProperty(pId) && one[pId] !== '') {            if (map[one[pId]]) {                let c = map[one[pId]].children || (map[one[pId]].children = []);                c.push(one);            } else {                if (!listMap[one[pId]]) listMap[one[pId]] = [one];                else listMap[one[pId]].push(one);            }        } else {            rootList.push(one);        }    }    return { list: rootList, map };};

使用

let data=[{    id:1,    text:'1'},{    id:2,    pId:1,    text:'2'}];let tree=listToTree(data);