【加急！！】json转成数组，求高手指教，在线等...

Question

aspx中有一个json对象msg，代码如下：
$.ajax({
            type: "POST",
            url: "UserExists.ashx",
            //用text接收
            dataType: "text",
            data: "userId=loadTiemTree",
            success: function (msg) {
                var $form = $("form");
                if (msg != null && msg != "") {
                    //把msg转换成数组
                    
                    //显示后台数据
                    $form.append("<div style=\"width:1000px;margin:0px auto;\"><div style=\"width:495px;float:left;border:1px outset red;\">"
                          + msg + "</div></div>");
                    $("#page_tag_load").hide();                } else {
                    $("#page_tag_load").hide();
                }
            }
        });输出后的结果如下：
[{"newid":"673"},{"newimg":"~/Sources/Image/treetime/20121010205839534.jpg"},{"newcontent":""}",{"newsclick":"0"},{"newtime":"2012/10/10 20:58:36"}][{"newid":"672"},{"newimg":"~/Sources/Image/treetime/20121010205844616.jpg"},{"newcontent":""}",{"newsclick":"0"},{"newtime":"2012/10/10 20:58:19"}][{"newid":"671"},{"newimg":"~/Sources/Image/treetime/20121010205713751.jpg"},{"newcontent":""}",{"newsclick":"0"},{"newtime":"2012/10/10 20:57:53"}][{"newid":"670"},{"newimg":"~/Sources/Image/treetime/20121010205758428.png"},{"newcontent":""}",{"newsclick":"0"},{"newtime":"2012/10/10 20:57:31"}]
我想在页面上把它转成数组，然后获取数组里面的信息赋给控件，该怎么做啊，求高手指教，在线等。

Answer 1

本帖最后由 net_lover 于 2012-10-14 19:15:32 编辑

  

Answer 2

我是这么写的：
try {
                        var arr = new Array();
                        arr = eval(msg);
                        alert(arr[0]);
                    } catch (e) {
                        alert(e);
                    }
然后抛了一个[object Object]的异常，求解？

Answer 3

本帖最后由 net_lover 于 2012-10-14 19:23:55 编辑

  

Answer 4

跪谢了，大神，已经可以获取到了。再请教个问题，就是在拼接json的时候有什么需要特别注意的吗？

Answer 5

本帖最后由 net_lover 于 2012-10-14 19:47:04 编辑

  

Answer 6

谢谢啊，今天终于把json这块弄的差不多了

Answer 7

for (i = 0; i < arr.length; i++) {
    alert(arr[i][0].newid);
    alert(arr[i][1].newimg);
  }
这个循环似乎只能打印出i=0时的值，而用
alert(arr[i].newid);
    alert(arr[i].newimg);打印时会undefined。
这是为嘛？

Answer 8

本帖最后由 net_lover 于 2012-10-14 20:24:06 编辑

  

Answer 9

格式似乎没问题，如下：
[{"newid":"677"},{"newimg":"~/Sources/Image/treetime/20121010205961316.jpg"},{"newcontent":""},{"newclick":"0"},{"newtime":"2012/10/10 21:14:41"},{"newid":"676"},{"newimg":"~/Sources/Image/treetime/20121010205961316.jpg"},{"newcontent":""},{"newclick":"0"},{"newtime":"2012/10/10 21:02:07"},{"newid":"675"},{"newimg":"~/Sources/Image/treetime/20121010205961316.jpg"},{"newcontent":""},{"newclick":"0"},{"newtime":"2012/10/10 20:59:17"},{"newid":"674"},{"newimg":"~/Sources/Image/treetime/2012101020597502.gif"},{"newcontent":""},{"newclick":"0"},{"newtime":"2012/10/10 20:59:05"},{"newid":"673"},{"newimg":"~/Sources/Image/treetime/20121010205839534.jpg"},{"newcontent":""},{"newclick":"0"},{"newtime":"2012/10/10 20:58:36"}]
for循环：
arr = eval('new Array(' + msg + ')');
                        for (var i = 0; i < arr.length; i++) {
                            alert(arr[i][0].newid);
                            alert(arr[i][1].newimg);
                            alert(arr[i][2].newcontent);
                            alert(arr[i][3].newclick);
                            alert(arr[i][4].newtime);
                        }
结果是只能弹出677这组信息，后面就没了，小弟愚钝，还望大神不吝赐

Answer 10

本帖最后由 net_lover 于 2012-10-14 22:46:20 编辑

  

Answer 11

改成这样了，还是不行
[{"newid":"677","newimg":"~/Sources/Image/treetime/20121010205961316.jpg","newcontent":"","newclick":"0","newtime":"2012/10/10 21:14:41"},{"newid":"676","newimg":"~/Sources/Image/treetime/20121010205961316.jpg","newcontent":"","newclick":"0","newtime":"2012/10/10 21:02:07"},{"newid":"675","newimg":"~/Sources/Image/treetime/20121010205961316.jpg","newcontent":"","newclick":"0","newtime":"2012/10/10 20:59:17"},{"newid":"674","newimg":"~/Sources/Image/treetime/2012101020597502.gif","newcontent":"","newclick":"0","newtime":"2012/10/10 20:59:05"},{"newid":"673","newimg":"~/Sources/Image/treetime/20121010205839534.jpg","newcontent":"","newclick":"0","newtime":"2012/10/10 20:58:36"}]
还是只能弹出第一个的信息