可能在另一台机器上部署了应用程序的虚拟目录，并让你在使用的绝对URL没能找到。

尝试使用这个code，而不是

  VAR urlStr ='＆LT;％：Url.Content（〜/项目/ ItemCount中）％＆GT;';
 

I'm posting to an ActionMethod to retrieve some customer counts. The post works fine from my local machine. When deployed to another server its throwing 404 errors. My post is below. I'm not sure why this has stopped working.

var urlStr = "/Items/ItemCount/";                    
                jQuery.ajax({
                    type: 'POST',
                    dataType: 'json',
                    url: urlStr,
                    async: false, //wait on the result to be  returned...                    
                    success: function (DocData) {
                        window.currentCount = DocData[0];
                        window.maximumAllowed = DocData[1];
                    },
                    cache: false,
                    error: function (request, status, error) {
                        alert(request.responseText);
                    }
                });

<HttpPost()> _
    Function ItemCount() As JsonResult

        Dim Items As List(Of MyItems) = GetItems()
        Dim Total As Integer = Items .Count            
        Dim Max = 5
        Dim Data As New ArrayList
        Data.Add(TotalDocs)
        Data.Add(MaxDocs)
        Return Json(Data)
    End Function

Probably on the other machine you have deployed the application in a virtual directory and so the absolute url you're using could not get found.

Try to use this code instead

var urlStr = '<%: Url.Content( "~/Items/ItemCount" ) %>';