js逆向常用代码

js逆向常用代码

加载

const loadingStyle = `#loadingDiv {position: fixed;z-index: 9999;top: 0;left: 0;width: 100%;height: 100%;background-color: rgba(255, 255, 255, 0.8);display: flex;align-items: center;justify-content: center;flex-direction: column;}.loader {border: 16px solid #f3f3f3;border-radius: 50%;border-top: 16px solid #3498db;width: 120px;height: 120px;animation: spin 2s linear infinite;}.loading-text {margin-top: 20px;font-size: 20px;color: #333;}@keyframes spin {0% { transform: rotate(0deg); }100% { transform: rotate(360deg); }}`;const loadingHTML = `<div id="loadingDiv"><div class="loader"></div><div class="loading-text">正在生成</div></div>`;// 显示加载页面的方法function showLoadingScreen() {// 创建样式元素并插入到head中const style = document.createElement("style");style.type = "text/css";style.id = "loadingStyle";style.innerHTML = loadingStyle;document.head.appendChild(style);// 创建加载层元素并插入到body中const loadingDiv = document.createElement("div");loadingDiv.innerHTML = loadingHTML;document.body.appendChild(loadingDiv);}// 隐藏加载页面的方法function hideLoadingScreen() {const loadingDiv = document.getElementById("loadingDiv");if (loadingDiv) {loadingDiv.style.display = "none";}const style = document.getElementById("loadingStyle");if (style) {style.remove();}}

拦截图片生成

var originalCreateObjectURL = URL.createObjectURL;
// 重写createObjectURL方法
URL.createObjectURL = function (blob) {// 调用原始的createObjectURL方法，并返回其结果var originalResult = originalCreateObjectURL(blob);// 返回重写后的结果return originalResult;
};

 // 保存原始的 Image 构造函数
const OriginalImage = window.Image;// 创建一个自定义的 Image 构造函数
function CustomImage() {const img = new OriginalImage();// 定义一个 setter 拦截 src 属性Object.defineProperty(img, "src", {set: function (url) {// 继续设置 src 属性img.setAttribute("src", url);},});return img;
}
window.Image = CustomImage;

const originalCreateElement = document.createElement;// 重写 createElement 方法document.createElement = function (tagName) {const element = originalCreateElement.call(document, tagName);if (tagName.toLowerCase() === "img") {// 定义一个 setter 拦截 src 属性Object.defineProperty(element, "src", {set: function (url) {element.setAttribute("src", url);},get: function () {return element.getAttribute("src");},});}return element;};

拦截apply函数

const originalApply = Function.prototype.apply;
Object.defineProperty(Function.prototype, "apply", {value: function (target, thisArg, argArray) {// 调用原始的 apply 方法return originalApply.call(this, target, thisArg, argArray);;},
});

拦截Function的构建函数

Function.prototype.constructor_ = Function.prototype.constructor;
Function.prototype.constructor=function Function(){console.log(arguments)return this.constructor_(...arguments)
}

拦截Vue加载

// 创建一个 MutationObserver 实例const observer = new MutationObserver((mutationsList) => {for (const mutation of mutationsList) {if (mutation.type === "childList") {// 遍历新增的节点for (const addedNode of mutation.addedNodes) {if (addedNode.tagName === "SCRIPT") {const scriptSrc = addedNode.src;// 检查是否为 Vue.js 文件if (scriptSrc && scriptSrc.includes("vue")) {// 监听 script 标签的 load 事件addedNode.addEventListener("load", () => {console.log("Vue.js 文件加载成功");// 在这里可以执行你需要的操作// 例如检查 Vue 是否可用if (typeof Vue !== "undefined") {const originalBeforeCreate = Vue.options.beforeCreate || [];Vue.options.beforeCreate = [function () {console.log("Vue instance is about to be created.",this);debugger// 在这里添加自定义代码},...originalBeforeCreate,];}});}}}}}});// 配置观察选项const config = { childList: true, subtree: true };// 开始观察 document.bodyobserver.observe(document.head, config);