var data=[{"uid":"2688","uname":"*江苏省南菁高级中学 022","sum":274.23},{"uid":"2689","uname":"*江阴国际会展中心管理有限公司 024","sum":0},{"uid":"2686","uname":"江苏申利实业股份有限公司 001","sum":7917.94},{"uid":"2715","uname":"江阴市吉达针纺有限公司 115","sum":41.39},{"uid":"2688","uname":"*江苏省南菁高级中学 022","sum":274.23}]

for(var i=0;i<data.length;i++){

        alert(i);

        alert(data[i]);

        alert("id:"+data[0].uid+"name:"+data[0].uname);

<table id="table">

    <tr>

        <th>uid</th>

        <th>uname</th>

        <th>sum</th>

    </tr>

</table>

window.onload=function(){

var data=[{"uid":"2688","uname":"*江苏省南菁高级中学 022","sum":274.23},{"uid":"2689","uname":"*江阴国际会展中心管理有限公司 024","sum":0},{"uid":"2686","uname":"江苏申利实业股份有限公司 001","sum":7917.94},{"uid":"2715","uname":"江阴市吉达针纺有限公司 115","sum":41.39},{"uid":"2688","uname":"*江苏省南菁高级中学 022","sum":274.23}]

        /*for(var i=0;i<data.length;i++){

        alert(i);

        alert(data[i]);

        alert("id:"+data[0].uid+"name:"+data[0].uname)

    }*/js循环读取json数据

    var table=document.getElementById("table");

    for(var i=0;i<data.length;i++){

        var row=table.insertRow(table.rows.length);

        var c1=row.insertCell(0);

        c1.innerHTML=data[i].uid;

        var c2=row.insertCell(1);

        c2.innerHTML=data[i].uname;

        var c3=row.insertCell(2);

        c3.innerHTML=data[i].sum;

    }

}