有没有办法检测外部JavaScript文件是否已完全加载？ [英] Is there a way to detect whether an external javascript file is fully loaded?

问题描述

我有一个使用 reCAPTCHA 来过滤机器人的网络表单。该表单有一个< script> 标记，用于在< iframe> 中加载验证码质询。如果此脚本无法加载，则不会出现验证码质询，也无法发送帖子。

I have a web form that uses reCAPTCHA to filter out robots. The form has a <script> tag that loads the captcha challenge in an <iframe>. If this script fails to load, then the captcha challenge would not appear and no one would be able to send a post.

有什么方法可以检测是否加载脚本以便我可以关闭此功能吗？

Is there any way that I can detect whether the script is loaded so that I can turn off this feature from my side?

推荐答案

附加加载指向reCAPTCHA的脚本元素的事件。

Attach the load event to the script element which points to reCAPTCHA.

var script = document.createElement("script");

script.addEventListener("load", function() {
   // Script has loaded.
});

script.src = "/path/to/recaptcha.js";

document.body.appendChild(script);

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