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DDoSolitary / 智慧树答案自动获取

// ==UserScript==
// @name         智慧树答案自动获取
// @namespace    https://ddosolitary.org/
// @version      0.2
// @author       DDoSolitary
// @match        https://onlineexamh5new.zhihuishu.com/stuExamWeb.html
// @grant        none
// @license      MIT
// @updateURL    https://openuserjs.org/meta/DDoSolitary/智慧树答案自动获取.meta.js
// ==/UserScript==

(function() {
	'use strict';

	var id;
	function getAnswers() {
		var questions = document.getElementsByClassName('examPaper_subject');
		if (questions.length === 0) {
			return;
		} else {
			clearInterval(id);
		}
		var cookie = document.cookie.split(';').find(function(s) {
			return s.trim().startsWith('CASLOGC=');
		});
		var uuid = JSON.parse(decodeURIComponent(cookie.split('=')[1])).uuid;
		var queries = [];
		for (var i = 0; i < questions.length; i++) {
			var question = questions.item(i);
			var options = question.querySelectorAll('input[type=radio], input[type=checkbox]');
			var optionIds = [];
			for (var j = 0; j < options.length; j++) {
				optionIds.push(options.item(j).value);
			}
			queries.push({
				optionsIdStr: optionIds.join(','),
				questionId: parseInt(question.querySelector('.subject_num span').id.substr(7))
			});
		}
		var xhr = new XMLHttpRequest();
		xhr.open('POST', 'https://studentexam.zhihuishu.com/studentExam/answer/getAnswerImgInfo', true);
		xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xhr.withCredentials = true;
		xhr.onload = function() {
			if (xhr.status !== 200) return;
			var response = JSON.parse(xhr.response);
			if (response.status !== '200') return;
			for (var i = 0; i < questions.length; i++) {
				var question = questions.item(i);
				if (question.parentElement.getElementsByClassName('reviewList').length > 0) {
					continue;
				}
				var img = new Image();
				img.src = response.rt[parseInt(question.querySelector('.subject_num span').id.substr(7))];
				img.style.width = '100%';
				question.appendChild(img);
			}
		};
		xhr.send('optionSortInfo=' + encodeURIComponent(JSON.stringify(queries)) + '&uuid=' + uuid);
	}
	id = setInterval(getAnswers, 1000);
})();