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()});