咖啡文件中的函数不能从其他js [英] functions in coffee-file are not available from other js
问题描述
我尝试在我的Grails项目中使用coffeescript。为了achive这个我决定使用coffeescript资源插件。但在结果视图中编译的咖啡如下:
(function(){
var someFunc;
someFunc = function(){
return alert(hello);
};
})call(this);
在这种情况下我不能调用它。我没有在插件文档中找到任何适当的配置,以避免在编译coffee文件时使用匿名函数。我如何解决这个问题?
从 fine manual :
词法范围和变量安全 >
[...]
虽然为了清楚起见在本文档中被禁止,但所有CoffeeScript输出都包含在一个匿名函数中:(function(){...} )();
这个安全包装,结合自动生成var
关键字,使得极其难以意外地污染全局命名空间。
如果您要为要使用的其他脚本创建顶级变量,请在窗口或导出对象。 存在操作符(如下所述),为您提供了一种可靠的方法来确定添加它们的位置;如果您同时定位CommonJS和浏览器:
exports?此
因此自调用函数包装器存在以防止污染全局命名空间。如果你想把东西放到全局命名空间中,你必须明确地把它放在那里;在浏览器中,你可以使用:
window.someFunc = - > alert('hello')
或
p $ p>
@someFunc = - > alert('hello')
@someFunc
form假定你在范围的顶部(即不在另一个函数或类中)。
或者,你可以找到一种方法来编译你的CoffeeScript - bare
:
。
-b,--bare
编译JavaScript而不使用 top -level function safety wrapper
I try to use coffeescript in my Grails-project. To achive this I decided to use coffeescript-resources plugin. But compiled coffee in result view looks like follows:
(function() {
var someFunc;
someFunc = function() {
return alert("hello");
};
}).call(this);
and in this case I cant call it. I have not found any proper configurations in the plugin documentation to avoid using anonymous functions while compiling coffee-file. How can I solve this?
From the fine manual:
Lexical Scoping and Variable Safety
[...]
Although suppressed within this documentation for clarity, all CoffeeScript output is wrapped in an anonymous function:(function(){ ... })();
This safety wrapper, combined with the automatic generation of thevar
keyword, make it exceedingly difficult to pollute the global namespace by accident.If you'd like to create top-level variables for other scripts to use, attach them as properties on window, or on the exports object in CommonJS. The existential operator (covered below), gives you a reliable way to figure out where to add them; if you're targeting both CommonJS and the browser:
exports ? this
So that self-invoking function wrapper exists to prevent you from polluting the global namespace. If you want to put something into the global namespace then you have to put it there explicitly; in a browser, you can do that using:
window.someFunc = -> alert('hello')
or
@someFunc = -> alert('hello')
The @someFunc
form assumes that you're at the top of the scope (i.e. not inside another function or class).
Alternatively, you could find a way to compile your CoffeeScript with --bare
:
-b, --bare
Compile the JavaScript without the top-level function safety wrapper.
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