JavaScript Magic Tricks: Ajax hacking

When communicating between the front-end and back-end, Ajax (Asynchronous Javascript And XML) is commonly used. In this article, a technique is demonstrated: intercepting and modifying data sent and received through Ajax.

Technical Principle

During Ajax communication, the open and send methods are used to send data, and the data return is obtained through the onreadystatechange event. To intercept bi-directional Ajax data, it is necessary to take over these methods.

Example code:

<script>
    (function(){

        //接管open、send方法
        var open = XMLHttpRequest.prototype.open;
        var send …

article asynchronous back communication data end front-end hacking javascript magic programming return security send technical webdev xml