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;(function () {
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function CustomEvent ( event, params ) {
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function ajaxEventTrigger(event) {
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function newXHR() {
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realXHR.addEventListener(‘abort‘, function () { ajaxEventTrigger.call(this, ‘ajaxAbort‘); }, false);
realXHR.addEventListener(‘error‘, function () { ajaxEventTrigger.call(this, ‘ajaxError‘); }, false);
realXHR.addEventListener(‘load‘, function () { ajaxEventTrigger.call(this, ‘ajaxLoad‘); }, false);
realXHR.addEventListener(‘loadstart‘, function () { ajaxEventTrigger.call(this, ‘ajaxLoadStart‘); }, false);
realXHR.addEventListener(‘progress‘, function () { ajaxEventTrigger.call(this, ‘ajaxProgress‘); }, false);
realXHR.addEventListener(‘timeout‘, function () { ajaxEventTrigger.call(this, ‘ajaxTimeout‘); }, false);
realXHR.addEventListener(‘loadend‘, function () { ajaxEventTrigger.call(this, ‘ajaxLoadEnd‘); }, false);
realXHR.addEventListener(‘readystatechange‘, function() { ajaxEventTrigger.call(this, ‘ajaxReadyStateChange‘); }, false);
let send = realXHR.send;
realXHR.send = function(...arg){
send.apply(realXHR,arg);
realXHR.body = arg[0];
ajaxEventTrigger.call(realXHR, ‘ajaxSend‘);
}
let open = realXHR.open;
realXHR.open = function(...arg){
open.apply(realXHR,arg)
realXHR.method = arg[0];
realXHR.orignUrl = arg[1];
realXHR.async = arg[2];
ajaxEventTrigger.call(realXHR, ‘ajaxOpen‘);
}
let setRequestHeader = realXHR.setRequestHeader;
realXHR.requestHeader = {};
realXHR.setRequestHeader = function(name, value){
realXHR.requestHeader[name] = value;
setRequestHeader.call(realXHR,name,value)
}
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window.addEventListener("ajaxReadyStateChange",function(e){
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if(xhr.readyState == 4 && xhr.status == 200){
// xhr.getAllResponseHeaders() 响应头信息
// xhr.requestHeader 请求头信息
// xhr.responseURL 请求的地址
// xhr.responseText 响应内容
// xhr.orignUrl 请求的原始参数地址
// xhr.body post参数，（get参数在url上面）
console.log(xhr.orignUrl);
}
});
$.ajax({
url:"./first/data/1.json?a=11",
type:"get",
data:{
a:11,
b:22
},
success(e){
console.log(e);
}
});
</script>
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原文：https://www.cnblogs.com/muamaker/p/12845218.html