如何访问先前 YUI.use() 调用中定义的函数

发布于 2024-11-16 18:10:59 字数 444 浏览 1 评论 0原文

[我是 YUI 新手]

我正在编写一个 Chrome 扩展程序，需要更改使用 YUI3 框架创建的网页的内容。

我已经确定，加载加载后在页面中运行的 JavaScript 的扩展必须调用先前在 YUI.add() 调用中定义的函数。

运行的原始 YUI 代码是这样的：

YUI.add("uuu", function (c) {
    ...
    c.theObject = niceStuff;
}
...
YUI().use("uuu", function (c) {
    c.theObject.doSomething();
}

是否有可能在这段代码运行后，我可以访问 c.theObject 的函数？

（我知道这可能违背 YUI3 良好的沙箱机制，但是这就是我在这里完成工作所需要的）。

原文

[I'm a YUI newbie]

I'm writing a Chrome extension that needs to change the contents of a web page created using the YUI3 framework.

I've identified that the extension, which injects javascript that runs in the page after it is loaded, must call a function that was previously defined in a YUI.add() call.

The original YUI code that runs is something like this:

YUI.add("uuu", function (c) {
    ...
    c.theObject = niceStuff;
}
...
YUI().use("uuu", function (c) {
    c.theObject.doSomething();
}

Is it possible that after this code runs, I can access a function of c.theObject?

(I understand this might go against YUI3's nice sandbox mechanism, but it's what I need to get the job done here).

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長街聽風 2024-11-23 18:10:59

您可能会遇到问题，因为每当创建 YUI() 实例时，它都会为您构建一个新的沙箱。除了少数例外，YUI 模块完全由其沙箱上下文包围。例如：

YUI().use('node', function(Y1) {
    YUI().use('node', function(Y2) {
        assert(Y1.Node === Y2.Node) // fails!
    });
});

如果从未将其分配给沙箱函数范围之外的变量，则您很可能无法访问所需的 theObject 的特定实例。如果 theObject 的任何实例都可以，您只需调用 YUI API 并获取您自己的版本即可使用。

You might have problems because any time a YUI() instance is created, it builds you a new sandbox. With a few exceptions, YUI modules are completely boxed by their sandbox context. For example:

YUI().use('node', function(Y1) {
    YUI().use('node', function(Y2) {
        assert(Y1.Node === Y2.Node) // fails!
    });
});

It's very possible that you may not be able to access the specific instance of theObject that you need, if it's never assigned to a variable outside the sandbox function scope. If any instance of theObject will do, you can just call into the YUI API and get your own version to play with.

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私藏温柔 2024-11-23 18:10:59

这对我有用： http://jsfiddle.net/sMAQx/1/

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家住魔仙堡 2024-11-23 18:10:59

一种方法是在“使用”YUI() 实例后捕获它。像这样：

YUI().add("uuu", function (c) {
    c.theObject = 'foo';
})

var yInstance = YUI().use("uuu", function (c) {
    c.theObject = 'booyaa';
})

yInstance.use('uuu',function(c){
console.log(c.theObject)
})
    // booyaa

One way to do it is to capture the YUI() instance after you 'use' it. Like this:

YUI().add("uuu", function (c) {
    c.theObject = 'foo';
})

var yInstance = YUI().use("uuu", function (c) {
    c.theObject = 'booyaa';
})

yInstance.use('uuu',function(c){
console.log(c.theObject)
})
    // booyaa

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