覆盖XMLHttpRequest的send方法 [英] Overriding XMLHttpRequest's send method

问题描述

我正在尝试通过覆盖XMLHttpRequest的send函数来记录（以及稍后修改）XMLHttpRequest发送到服务器的数据。我的函数将数据正确记录到控制台，但请求没有完成，因此浏览器会无限期地等待响应。任何想法代码有什么问题？

I'm trying to log (and later modify) the data XMLHttpRequest sends to a server by overriding XMLHttpRequest's send function. My function logs the data correctly to the console, but the request doesn't finish, so the browser keeps waiting for the response indefinitely. Any ideas what's wrong with the code?

XMLHttpRequest.prototype.realSend = XMLHttpRequest.prototype.send;
var newSend = function(vData) { console.log("data: " + vData); realSend(vData); };
XMLHttpRequest.prototype.send = newSend;

推荐答案

XMLHttpRequest.prototype.realSend = XMLHttpRequest.prototype.send;
// here "this" points to the XMLHttpRequest Object.
var newSend = function(vData) { console.log("data: " + vData); this.realSend(vData); };
XMLHttpRequest.prototype.send = newSend;

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