// ==UserScript==
// @name         XHR劫持返回内容例子
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        http://127.0.0.1:8000/1.html
// @icon         https://www.google.com/s2/favicons?domain=undefined.
// @grant        none
// ==/UserScript==
var oldxhr=window.XMLHttpRequest
function newobj(){}

window.XMLHttpRequest=function(){
    let tagetobk=new newobj();
    tagetobk.oldxhr=new oldxhr();
    let handle={
        get: function(target, prop, receiver) {
            if(prop==='oldxhr'){
                return Reflect.get(target,prop);
            }
            if(typeof Reflect.get(target.oldxhr,prop)==='function')
            {
                if(Reflect.get(target.oldxhr,prop+'proxy')===undefined)
                {
                    target.oldxhr[prop+'proxy']=new Proxy(Reflect.get(target.oldxhr,prop), {
                        apply: function(target, thisArg, argumentsList) {
                            debugger;
                            return Reflect.apply(target, thisArg.oldxhr, argumentsList);
                        }
                    });

                }
                return Reflect.get(target.oldxhr,prop+'proxy')
            }
            if(prop.indexOf('response')!==-1)
            {
                console.log('我们劫持成功了！',Reflect.get(target.oldxhr,prop))
                return 'FFFFFFFFUCK'
            }
            return Reflect.get(target.oldxhr,prop);
        },
        set(target, prop, value) {
            return Reflect.set(target.oldxhr, prop, value);
        },
        has(target, key) {
            debugger;
            return Reflect.has(target.oldxhr,key);
        }
    }

    let ret = new Proxy(tagetobk, handle);

    return ret;
}