访问 CoffeeScript 默认包装器中的文档
Coffeescript 将您的代码包装到像这里这样的包装器中
(function() {
/* your code */
}).call(this);
，this 表示 window。因此，要创建一个公共接口，我
this.publicObject =
someMethod: ->
document.getElementById("button1").innerHTML = "Changed!"
会执行类似的操作，然后在 HTML 文档中注册一个回调，使用 Click。
但是，如果我想从 .coffee 文件调用 someMethod （在文档准备好时调用，我认为 编辑：请参阅下面接受的答案+评论）怎么办？如果我只是按照上面的代码进行操作，
publicObject.someMethod()
由于上下文问题，似乎在 someMethod 中无法访问文档对象。 如何从我的 .coffee 文件中调用 publicObject.someMethod() 并让它识别 document？
注意：apply()< /code> 和 call() 欺骗是可以的，但如果可能的话，我不想摆脱包装器。如果您关心，我使用以下内容来编译我的脚本：
coffee -j -p -c coffee/*.coffee > www/app.js
Coffeescript wraps your code into a wrapper like
(function() {
/* your code */
}).call(this);
Here, this means window. So, to create a public interface I do something like
this.publicObject =
someMethod: ->
document.getElementById("button1").innerHTML = "Changed!"
I can then register a callback in the HTML document invoking my .js file with something like <span onclick="publicObject.someMethod();">Click</span>.
However, what if I wanted to call someMethod from the .coffee file (to be called on document ready, I think EDIT: See accepted answer + comments below)? If I just follow the above code up with
publicObject.someMethod()
it seems like the document object is not accessible within someMethod due to context issues. How can I call publicObject.someMethod() from my .coffee file and have it recognize document?
Note: apply() and call() trickery is OK, but I don't want to get rid of the wrapper, if possible. If you care, I use the following to compile my script:
coffee -j -p -c coffee/*.coffee > www/app.js
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评论（2）
包装器不会隐藏
document，它是全局的，因为它附加到window。除非您在.coffee文件中声明了名为document的变量（通过编写document = ...），document< /code> 可以从someMethod访问。尝试将console.log 文档添加到someMethod的顶部来自行检查。所以一定还有其他事情发生。调用
someMethod时收到的错误消息到底是什么？The wrapper doesn't hide
document, which is a global because it's attached towindow. Unless you've declared a variable nameddocumentwithin your.coffeefile (by writingdocument = ...),documentwill be accessible fromsomeMethod. Try addingconsole.log documentto the top ofsomeMethodto check for yourself.So there must be something else going on. What exactly is the error message you get when
someMethodis called?只需执行
window.publicObject.someMethod()即可。这避免了整个变量this范围问题。您可以在 CS 代码的顶级范围中互换使用this和window，但是一旦进入函数内部，您就需要使用window代码>.我建议一直使用window，因为它的A）更清晰，B）回避了整个这个问题，这个问题导致了无数个小时的头痛。另外，这是我使用的命名空间模式。我创建了 1 个顶级全局对象，并将所有内容整齐地悬挂在该对象上。事情是这样开始的。
Just do
window.publicObject.someMethod(). This avoids the whole variablethisscope issue. You can usethisandwindowinterchangeably in the top level scope of you CS code, but once you get inside functions, you'll need to usewindow. I suggest usingwindowall the time as its A) clearer and B) sidesteps the wholethisissue which has caused countless hours of head scratching.Also, this is the namespace pattern I use. I create 1 top-level global object and hang everything off of that neatly. It starts like this.