使书签执行下载的功能 [英] Make A Bookmarklet Execute A Function That It Downloads

问题描述

我想创建一个书签，该书签下载一个远程javascript文件，该文件中定义了一个函数，然后使用硬编码到该书签中的参数执行该函数.

I would like to create a bookmarklet that downloads a remote javascript file in which a function is defined and then executes that function with parameters that are hard-coded into the bookmarklet.

这是您的标准下载并运行远程脚本"书签，在最后一行中有一个额外的函数调用:

Here is your standard "download-and-run-remote-script" bookmarklet with an extra function call in the last line:

javascript:( function () { 
    var new_script = document.createElement("script"); 
    new_script.src = "http://mydomain.com/myscript.js"; 
    document.body.appendChild(new_script);
    do_stuff('Hello World!');
} ) ();

这是myscript.js的内容:

Here are the contents of myscript.js:

function do_stuff(input_variable) {
    alert(input_variable);
}

按照书面规定，这不会做任何事情.为什么不?我应该怎么做?

As written, this doesn't do anything. Why not? What should I do differently?

推荐答案

脚本异步加载.这意味着在您尝试运行该函数之前，脚本不会完成加载.

Scripts load asynchronously. That means that the script doesn't finish loading before you try to run the function.

解决方案1.)小书签中的myvar = 'Hello World!'和myscript.js中的do_stuff(myvar).

Solution 1.) myvar = 'Hello World!' in bookmarklet and do_stuff(myvar) in myscript.js.

解决方案2.)将onload事件用于创建的脚本元素.更强大，但更复杂.

Solution 2.) Use the onload event for the script element you create. More robust, but more complicated.

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