当响应不是错误时，重定向到页面-Redirecttoapagewhenthereponseisnoterror

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Change your ajax call to this, i think thats what you want

将你的ajax调用更改为此,我认为这就是你想要的

$.ajax({ 
    success: function(data, textStatus, jqXHR) {
        var obj = jQuery.parseJSON(data);
        if(obj.errorMessages == undefined)
        {
            window.location.href=burl+"/browse/"+pkey+"#selectedTab=com.atlassian.jira.plug‌​in.system.project%3Aversions-panel"; 
        }
        else
        {
            alert("error");
        }
    }, 
    error: function() { 
        alert("error"); 
    } 
});

the "error" function is for errors happening with the ajax call. but your ajax call is always successful because you always get a valid response. therefor you got to check the returned json for errors

“错误”函数用于ajax调用发生的错误。但是你的ajax调用总是成功的,因为你总能获得有效的响应。因此你必须检查返回的json是否有错误