// 从浏览器中知道Document是全局的，new Document会返回一个对象 var Document = function Document() { // 构造函数 }; catvm.safefunction(Document); // 浏览器 Object.defineProperties(Document.prototype, { [Symbol.toStringTag]: { value: "Document", configurable: true } }); document = {}; document.__proto__ = Document.prototype; ////////// 浏览器代码自动生成部分 document.cookie = ''; document.referrer = location.href || ''; document.getElementById = function getElementById(id) { debugger; // 用id匹配当前环境内存中已有的Element，没找到则返回null return null; }; catvm.safefunction(document.getElementById); document.getElementsByTagName = function getElementsByTagName(tag_name) { var map_tag = {'body': [""]}; debugger; return map_tag[tag_name] }; catvm.safefunction(document.getElementsByTagName); document.addEventListener = function addEventListener(type, listener, options, useCapture) { debugger; }; catvm.safefunction(document.addEventListener); document.createElement = function createElement(tagName) { tagName = tagName.toLowerCase(); if (catvm.memory.htmlelements[tagName] == undefined) { debugger; } else { var tagElement = catvm.memory.htmlelements[tagName](); return catvm.proxy(tagElement); } }; catvm.safefunction(document.createElement); //////// // 浏览器中document是全局的，因此我们也需要定义一个document document = catvm.proxy(document);