懂了你的意思，viewdata这个东西是可以在js上面直接用的，只要你之前跳转的控制器写了他，直接@ViewData["Diseaseinfo"] ,就可以得到了，    success: function (result) {
                      @ViewData["Diseaseinfo"]直接用
                        }

引用 1 楼 qq_34082025 的回复:

懂了你的意思，viewdata这个东西是可以在js上面直接用的，只要你之前跳转的控制器写了他，直接@ViewData["Diseaseinfo"] ,就可以得到了，    success: function (result) {
                      @ViewData["Diseaseinfo"]直接用
                        }

那怎么输出这个视图内的数据呢？
                                                <tbody>
                                                    @{
                                                        System.Data.DataTable dt=(System.Data.DataTable)ViewData["diseaseuserinfo"];
                                                        if(dt.Rows.Count>0){
                                                        for(int i=0;i<dt.Rows.Count;i++)
                                                           {
                                                        <tr class="gradeA">
                                                        <td class="center">@i</td>
                                                        <td class="center">@dt.Rows[i]["Code"]</td>
                                                        <td class="center">@dt.Rows[i]["Name"]</td>
                                                        <td class="center">@dt.Rows[i]["Age"]</td>
                                                        <td class="center">@dt.Rows[i]["CardID"]</td>
                                                        <td class="center tdcursor"><a href="#myModal" data-toggle="modal" class="btn btn-xs btn-info" onclick="alo('@dt.Rows[i]["Name"]','@dt.Rows[i]["CardID"]')">诊断信息</a></td>
                                                        </tr> 
                                                           }                                                        
                                                        }
                                                    }
                                                 
                                                </tbody>
Razor可以这样写   JS怎么操作呢 
我这样 可行嘛                     
                success: function (data) {
                   // alert(data);
                    alert(@ViewData["Diseaseinfo"]);
                },

如果对js处理viewdata不熟悉的话，可以把viewdata的内容在后台放到json中返回到页面里，然后在 success: function (result) { }这个方法里对result进行操作，result里包含了后台viewdata的数据

引用 3 楼 sinat_28984567 的回复:

如果对js处理viewdata不熟悉的话，可以把viewdata的内容在后台放到json中返回到页面里，然后在 success: function (result) { }这个方法里对result进行操作，result里包含了后台viewdata的数据

这样操作嘛？
路由返回
return Json(ViewData["Diseaseinfo"], JsonRequestBehavior.AllowGet);
然后
                success: function (data) {
                    alert(data);          
                },
这样吗？

变成Json再遍历就是了

var items = @Html.Raw(Json.Encode(ViewData["Diseaseinfo"]));

if(items && items.length != 0){

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

           document.write(items[i].Name);

     }

}

引用 5 楼 dongxinxi 的回复:

变成Json再遍历就是了

var items = @Html.Raw(Json.Encode(ViewData["Diseaseinfo"]));

if(items && items.length != 0){

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

           document.write(items[i].Name);

     }

}

                success: function (data) {
                    if (data && data.length != 0) {
                        for (var i = 0; i < data.length; i++) {
                            document.write(data[i].ID);
                        }
                    }
                },
我是这样操作的  直接输出data 可以看到json数组,但是按照上面的循环, 就是输出无数个 undefined
json如下：[{"ID":50,"Code":"20161222","CardID":"4114XXXXXXXX2441","Disease":"稽留流产","ICD":"","SureDate":"2016/12/1 ","State":1,"RecorderID":0,"HospitalID":2,"Hospital":"南通大学附属医院"},{"ID":53,"Code":"20161222","CardID":"4114XXXXXXXX2441","Disease":"稽留流产","ICD":"","SureDate":"2016-12-01","State":1,"RecorderID":1,"HospitalID":1,"Hospital":"医联网"}]

很奇怪的是  这次 连弹出 alert(data[0].ID) 都没有值

你用ajax返回的话就是json字符串了，我上面写的话就是json对象，js虽然是弱类型的，但并不意味着完全没有类型验证
 success: function (data) {
                     if (data && data.length != 0) {
                         data = JSON.parse(data);
                         for (var i = 0; i < data.length; i++) {
                             document.write(data[i].ID);
                         }
                     }
                 },

引用 7 楼 dongxinxi 的回复:

你用ajax返回的话就是json字符串了，我上面写的话就是json对象，js虽然是弱类型的，但并不意味着完全没有类型验证
 success: function (data) {
                     if (data && data.length != 0) {
                         data = JSON.parse(data);
                         for (var i = 0; i < data.length; i++) {
                             document.write(data[i].ID);
                         }
                     }
                 },

感谢 问题解决 

data = JSON.parse(data);

把传回的json格式解析为对象,之后再遍历取值,  少了一步解析 , 谢谢