我们拿到的数据格式是
我们想要用来渲染页面的格式是
第一步，找出最上面的节点。很明显的parentId为空的数据是最上面的节点。
第二步，找出第二节点加到父节点child数组里面
newList 就是我们的结果。
步骤二三也可以这样处理，可以防止curList.length的值不为空的时候无限循环回调
1、方法思路使用js数组自带的filter()方法；数据格式要求，父子节点通过，Id，ParentId进行关联。默认父结节id为0。
样例数据：var jsonData = [{"id":"1","pid":"0","name":"家用电器"}, {"id":"4","pid":"1","name":"大家电"}, {"id":"5","pid":"1","name":"生活电器"}, {"id":"2","pid":"0","name":"服饰"}, {"id":"3","pid":"0","name":"化妆"}, {"id":"7","pid":"4","name":"空调"}, {"id":"8","pid":"4","name":"冰箱"}, {"id":"9","pid":"4","name":"洗衣机"}, {"id":"10","pid":"4","name":"热水器"}, {"id":"11","pid":"3","name":"面部护理"}, {"id":"12","pid":"3","name":"口腔护理"}, {"id":"13","pid":"2","name":"男装"}, {"id":"14","pid":"2","name":"女装"}, {"id":"15","pid":"7","name":"海尔空调"}, {"id":"16","pid":"7","name":"美的空调"}, {"id":"19","pid":"5","name":"加湿器"}, {"id":"20","pid":"5","name":"电熨斗"}]
2、实现方法：
function creatTreeData(list){
var clonelist = JSON.parse(JSON.stringify(list))
var result =clonelist.filter(function(father){
var childlist = clonelist.filter(function(child){
return father.id= child.pid
})
if(childlist.length>0){
father.children=childlist
}
return father.pid ==0
})
return result
}
3、方法封装
function treeData(list,id,pid,children){
var clone = JSON.parse(JSON.stringify(list))
return clone.filter(function(father){
var childlist =clone.filter(function(child){
return father[id]==child[pid]
})
if(childlist.length>0){
father[children]=childlist
}
return father[pid]==0
})
}
