js performs tree partitioning of json data

This article mainly shares with you the example code of js dividing the returned json data into a tree. I hope it can help you.

 $.ajax({
    type: "get",
    url: 'data.json',
    success:function(data){
    var jsondata = JSON.parse(data); //返回的数据是json字符串,把它转换成json对象,如果是json对象则不需转换
    var topArr = []; //声明一个数组，存储所有的json数据
    for (var i = 0; i< jsondata.length; i++) {        if (jsondata[i].parentid == 0) {
            jsondata[i].data = []; //给一级菜单下面添加data数据，存放二级菜单
            topArr.push(jsondata[i]);  //得到一级菜单
        }
    }    for (var j = 0; j < topArr.length; j++) {       for (var i = 0; i < jsondata.length; i++) {           if (jsondata[i].parentid == topArr[j].id) {
               jsondata[i].data = [];
               topArr[j].data.push(jsondata[i]);  //把获取的二级菜单存放到一级菜单的data对象中
           }
       }
   }    for (var j = 0; j < topArr.length; j++) {        for (var m = 0; m < topArr[j].data.length; m++) {            for (var i = 0; i < jsondata.length; i++) {                if (jsondata[i].parentid == topArr[j].data[m].id)    {
                   topArr[j].data[m].data.push(jsondata[i]); //把获取的三级菜单存放到二级菜单的data对象中
                }
            }
        }
    }
    }
});
               
 $.ajax({
    type: "get",
    url: &#39;data.json&#39;,
    success:function(data){
    var jsondata = JSON.parse(data); //返回的数据是json字符串,把它转换成json对象,如果是json对象则不需转换
    var topArr = []; //声明一个数组，存储所有的json数据
    for (var i = 0; i< jsondata.length; i++) {        if (jsondata[i].parentid == 0) {
            jsondata[i].data = []; //给一级菜单下面添加data数据，存放二级菜单
            topArr.push(jsondata[i]);  //得到一级菜单
        }
    }    for (var j = 0; j < topArr.length; j++) {       for (var i = 0; i < jsondata.length; i++) {           if (jsondata[i].parentid == topArr[j].id) {
               jsondata[i].data = [];
               topArr[j].data.push(jsondata[i]);  //把获取的二级菜单存放到一级菜单的data对象中
           }
       }
   }    for (var j = 0; j < topArr.length; j++) {        for (var m = 0; m < topArr[j].data.length; m++) {            for (var i = 0; i < jsondata.length; i++) {                if (jsondata[i].parentid == topArr[j].data[m].id)    {
                   topArr[j].data[m].data.push(jsondata[i]); //把获取的三级菜单存放到二级菜单的data对象中
                }
            }
        }
    }
    }
});

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