javascript 如何在 CoffeScript 中传递两个匿名函数作为参数？
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How to pass two anonymous functions as arguments in CoffeScript?
提问by glortho
I want to pass two anonymous functions as arguments for jQuery's hover, like so:
我想传递两个匿名函数作为 jQuery 悬停的参数，如下所示：
$('element').hover(
function() {
// do stuff on mouseover
},
function() {
// do stuff on mouseout
}
);
It's easy with just one – hover ->– but what is the proper syntax in CoffeeScript for two? I tried ...hover ->, ...hover( ->..., etc. but nothing gets me the above structure.
只需要一个就很容易了hover ->——但是CoffeeScript 中两个的正确语法是什么？我试过...hover ->，...hover( ->...等等，但没有什么能让我得到上述结构。
采纳答案by Joe Cheng
Put parentheses around the anonymous functions.
将括号括在匿名函数周围。
回答by Anurag
I think the problem lies with using single line comments //. Single-line comments enclosed in /* .. */seem to work fine. Here's an equivalent example with something other than a comment.
我认为问题在于使用单行注释//。包含在中的单行注释/* .. */似乎工作正常。这是一个等效的示例，其中包含注释以外的内容。
$('element').hover(
-> console.log("first")
-> console.log("second")
)
Or with comments using /* .. */.
或者使用/* .. */.
$('element').hover(
-> /* first */
-> /* second */
)
You can try these examples under the Try CoffeeScripttab. CoffeeScript adds a return statement to return the last expression of the function. If you wanted bare-bones functions which do nothing and don't contain a returnat the end, try:
您可以在Try CoffeeScript选项卡下尝试这些示例。CoffeeScript 添加了一个 return 语句来返回函数的最后一个表达式。如果您想要什么都不做return并且最后不包含 a 的基本函数，请尝试：
$('element').hover(
() ->
() ->
)
// $('element').hover(function() {}, function() {});
回答by kevinhyunilkim
Another way is to use backslashafter the caller function, the comma should be indented correctly.
另一种方法是在调用函数后使用反斜杠，逗号应正确缩进。
$('element').hover \
-> # do stuff on mouseover
,
-> # do stuff on mouseout
