jQuery : 有关TypeError: invalid ‘in’ operand obj的错误

参考 lwx2615 的博客 ，网站：  http://blog.csdn.net/lwx2615/article/details/9668777

由PHP返回一个json数据

$.ajax({
         url:"<?= \yii\helpers\URL::to(['sign/search']) ?>",
         type:"get",
         data:"time1="+time1+"&time2="+time2,
         success:function(msg){
                var str = new String();
                $.each(msg, function(a,b){
                    str+="<tr>";
                    str+="<td>"+b.indent+"</td>";
                    str+="<td>"+b.user+"</td>";
                    str+="<td>"+b.time+"</td>";
                    str+="<td>"+b.hao+"</td>";
                    str+="<td>"+b.movie+"</td>";
                    str+="</tr>";
                });

使用each解析时候，就会报错TypeError: invalid ‘in’ operand obj。

改为

$.ajax({
         url:"<?= \yii\helpers\URL::to(['sign/search']) ?>",
         type:"get",
         data:"time1="+time1+"&time2="+time2,
         success:function(msg){
                var str = new String();
                obj= $.parseJSON(msg);     //转化一下数据
                $.each(obj, function(a,b){
                    str+="<tr>";
                    str+="<td>"+b.indent+"</td>";
                    str+="<td>"+b.user+"</td>";
                    str+="<td>"+b.time+"</td>";
                    str+="<td>"+b.hao+"</td>";
                    str+="<td>"+b.movie+"</td>";
                    str+="</tr>";
                });
                $("#table").html(str);
            }