Coffeescript 将文件包装在函数中
由于某种原因，coffeescript 编译器在编译时将所有 .coffee 文件包装在一个函数中。例如，如果我有 test.coffee:
class TestClass
constructor: (@value) ->
printValue: () ->
alert(@value)
printAValue = () ->
test = new TestClass()
test.printValue()
那么我得到 test.js:
(function() {
var TestClass, printAValue;
TestClass = (function() {
function TestClass(value) {
this.value = value;
}
TestClass.prototype.printValue = function() {
return alert(this.value);
};
return TestClass;
})();
printAValue = function() {
var test;
test = new TestClass();
return test.printValue();
};
}).call(this);
My simple html file won't work with this:
<html>
<head>
<script src="test.js"></script>
</head>
<body onload="printAValue()">
</body>
</html>
我以前没有使用过太多 JS，我不会怀疑咖啡编译器，但是它应该如何运作？如何
The coffeescript compiler is, for some reason, wrapping all of my .coffee files in a function when they are compiled. For example, if I have test.coffee:
class TestClass
constructor: (@value) ->
printValue: () ->
alert(@value)
printAValue = () ->
test = new TestClass()
test.printValue()
then I get test.js:
(function() {
var TestClass, printAValue;
TestClass = (function() {
function TestClass(value) {
this.value = value;
}
TestClass.prototype.printValue = function() {
return alert(this.value);
};
return TestClass;
})();
printAValue = function() {
var test;
test = new TestClass();
return test.printValue();
};
}).call(this);
My simple html file won't work with this:
<html>
<head>
<script src="test.js"></script>
</head>
<body onload="printAValue()">
</body>
</html>
I haven't worked with much JS before, and I wouldn't doubt the coffee compiler, but is the way it should work? How
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请参阅我的回答关于在文件/模块之间共享js代码。另外仅供参考，包装函数的设计目的是防止意外的全局变量。您可以通过将
--bare传递给咖啡编译器命令行工具来禁用 with，但这是有充分理由的最佳实践。See my answer here on sharing jS code between files/modules. Also FYI the wrapper function is by design to prevent unintentional global variables. You can disable with by passing
--bareto the coffee compiler command line tool, but it is a best practice with good reason.切勿在 HTML 中添加事件侦听器。将它们添加到您的 JavaScript 中，最好在您定义事件处理程序的同一范围内。
如果您绝对需要将某些内容导出到全局范围，请导出到 window 对象：
Never add event listeners in HTML. Add them in your JavaScript, preferably in the same scope in which you define the event handler.
If you absolutely need to export something to the global scope, export to the window object: