将任意数量的参数传递给JavaScript函数 [英] Pass an arbitrary number of parameters into a JavaScript function

问题描述

我的JavaScript代码几乎不是一个Ajax请求，它期望从后端返回XML.后端可以将 execute_callback 作为以下XML标签之一返回:

My JavaScript code is barely an Ajax request that expects XML to be returned from back-end. The back-end can return execute_callback as one of XML tags like this:

<?xml version="1.0" encoding="windows-1251"?>
<response>
    <execute_callback>
        <function_name>someFunction</function_name>
    </execute_callback>
</response>

只要您知道此回调期望的确切参数数量，一切都可以.但是如果后端返回了该怎么办

And everything is okay as far as you know the exact number of parameters this callback expects. But what if the back-end has returned

<?xml version="1.0" encoding="windows-1251"?>
<response>
    <execute_callback>
        <function_name>someFunction</function_name>
        <param>10.2</param>
        <param>some_text</param>
    </execute_callback>
    <execute_callback>
        <function_name>otherFunction</function_name>
        <param>{ x: 1, y: 2 }</param>
    </execute_callback>
</response>

我现在如何将参数10.2和'some_text'传递给 someFunction 和JSON {x:1，y:2}传递给 otherFunction ?

How do I now pass parameters 10.2 and 'some_text' to someFunction and JSON { x: 1, y: 2 } to otherFunction?

我知道一个丑陋的解决方案(使用函数的 arguments )，但是我正在寻找一个漂亮的解决方案.

I know an ugly solution (using function's arguments), but I am looking for a pretty one.

在我忘记之前:不要为我解析XML-我可以自己做:)我所需要的只是某种技巧，可以将任意数量的参数传递给JavaScript中的函数.如果您知道 Python ，我想要:

And before I forget: don't parse the XML for me - I can do that on my own :) All I need is somewhat of a trick to pass an arbitrary number of arguments to a function in JavaScript. If you know Python, I want:

def somefunc(x, y):
    print x, y
args = { 'x' : 1, 'y' : 2 }
somefunc(**args)

但使用JavaScript.

but in JavaScript.

推荐答案

您可以参考 Function.apply .假设在全局对象(浏览器中的 window )中声明了回调函数.

You could refer to Function.apply. Assuming the callback functions are declared in global object (window in browser).

var callback_function = window[function_name];
if (callback_function) { // prevent from calling undefined functions
    callback_function.apply(window, params);  // params is an array holding all parameters
}

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