摘要：
JSON.stringify(val, replacer, space) function format(val, replacer, space) { // TODO var fn = (data, spaceIn) =>{ let type = Object.prototype.toString 阅读全文
摘要：
形成树，此方法有局限性，id和parentId 都是顺序添加的 var data = [ {id:1,name:'json',parentId:0}, {id:2,name:'json',parentId:0}, {id:3,name:'json',parentId:1}, {id:4,name:' 阅读全文