// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://lnyy.yxbyun.com/newnorthstu*
// @icon         https://www.google.com/s2/favicons?domain=yxbyun.com
// @grant        none
// @run-at document-start
// ==/UserScript==

function addXMLRequestCallback(callback){
    var oldSend, i;
    if( XMLHttpRequest.callbacks ) {
        // we've already overridden send() so just add the callback
        XMLHttpRequest.callbacks.push( callback );
    } else {
        // create a callback queue
        XMLHttpRequest.callbacks = [callback];
        // store the native send()
        oldSend = XMLHttpRequest.prototype.send;
        // override the native send()
        XMLHttpRequest.prototype.send = function(){
            // process the callback queue
            // the xhr instance is passed into each callback but seems pretty useless
            // you can't tell what its destination is or call abort() without an error
            // so only really good for logging that a request has happened
            // I could be wrong, I hope so...
            // EDIT: I suppose you could override the onreadystatechange handler though
            console.log('劫持了')
            for( i = 0; i < XMLHttpRequest.callbacks.length; i++ ) {
                XMLHttpRequest.callbacks[i]( this,arguments );
            }
            // call the native send()
            oldSend.apply(this, arguments);
        }
    }
}

// e.g.
addXMLRequestCallback( function( xhr,test ) {
    xhr.addEventListener("load", function(){
        if ( xhr.readyState == 4 && xhr.status == 200 ) {
            if(xhr.responseURL.indexOf("yxbstudent/studentWeb/toIndex")!=-1){
                if(test.length>0&&test[0].indexOf("getWorkPaperInfo")!=-1){
                    console.log( xhr,test );
                    let obj=JSON.parse(xhr.response)
                    let settext=""
                    obj.data.questionList.forEach((item)=>{
                        settext+=item.content.correct+"</br>-----------------------------------------</br>"
                    })
                    settext+='<span style="color:red;font-size:19px">出处油猴中文网bbs.tampermonkey.net.cn 作者：李恒道</span>'
                    let div=document.createElement("div");
                    div.innerHTML=settext;
                    document.querySelector('.test_main').prepend(div)


                }
            }

        }
    });

});