CHROME扩展笔记之监听页面xhr请求

在页面头部加载完时立即注入下面代码，注入完成后如若有xhr请求就可以监听到了

;(function () {
     
	if ( typeof window.CustomEvent === "function" ) return false;
   
	function CustomEvent ( event, params ) {
     
		params = params || {
      bubbles: false, cancelable: false, detail: undefined };
		var evt = document.createEvent( 'CustomEvent' );
		evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
		return evt;
	}   
	CustomEvent.prototype = window.Event.prototype;   
	window.CustomEvent = CustomEvent;
})();
;(function () {
     
	function ajaxEventTrigger(event) {
     
		var ajaxEvent = new CustomEvent(event, {
      detail: this });
		window.dispatchEvent(ajaxEvent);
	}
    
	var oldXHR = window.XMLHttpRequest;
   
	function newXHR() {
     
		var realXHR = new oldXHR();

		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)
		}
		return realXHR;
	}
   
 	window.XMLHttpRequest = newXHR;
})();
var Gpins_data = {
     };
// 监听页面的ajax
window.addEventListener("ajaxReadyStateChange",function(e){
     
	let xhr = e.detail;
	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);
		
	}
});
// console.log({msg:'注入完成',time: (new Date()).valueOf(),data: new Date()});