检测Ajax请求是否在JavaScript中失败 [英] Detect if Ajax Request had failed in JavaScript

问题描述

如何检测Ajax请求是否无法加载文件.

How can I detect whether an Ajax request failed to load a file.

这是我的代码供参考:

var pro = undefined;
var xmlhttp;
if (window.XMLHttpRequest){
    xmlhttp = new XMLHttpRequest();
}
else{
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function(){
    if (xmlhttp.readyState==4 && xmlhttp.status==200){
        pro = JSON.parse(xmlhttp.responseText);
    }
}
xmlhttp.open("GET","data.json",true);
xmlhttp.send();

请不要使用jQuery.

Please, no jQuery.

谢谢！

推荐答案

您可以检查http状态是500还是大于500，这表示请求

you can check if the http status is 500 or more than 500 which means an error occurred in the request http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#5xx_Server_Error

 if (xmlhttp.status >= 500){
    alert('error');
 }

注意:您还可以根据需要考虑其他http状态编号

NOTE: you can also consider other http status numbers as you like

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