// ==UserScript==
// @name         职业资格跳过摄像头验证
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  try to take over the world!
// @author       You
// @match        https://www.bjjnts.cn/lessonStudy/*
// @grant        GM_setValue
// @grant        GM_getValue
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    console.log(is_supported_userMedia);
    window.setInterval(showalert, 1000);
function showalert()
{
    isface=0;
    beginFaceSign=0;
is_supported_userMedia='';
}
    start.removeEventListener('click')
    // Your code here...
})();