javascript 带有函数参数的方法链
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Method chaining with function arguments
提问by nicholaides
What's the best way to chain methods in CoffeeScript? For example, if I have this JavaScript how could I write it in CoffeeScript?
在 CoffeeScript 中链接方法的最佳方式是什么？例如，如果我有这个 JavaScript，我如何用 CoffeeScript 编写它？
var req = $.get('foo.htm')
.success(function( response ){
// do something
// ...
})
.error(function(){
// do something
// ...
});
回答by a paid nerd
Using the latest CoffeeScript, the following:
使用最新的 CoffeeScript，如下：
req = $.get 'foo.html'
.success (response) ->
do_something()
.error (response) ->
do_something()
...compiles to:
...编译为：
var req;
req = $.get('foo.html').success(function(response) {
return do_something();
}).error(function(response) {
return do_something();
});
回答by Trevor Burnham
There are two approaches you can take: The best "literal" translation to CoffeeScript is (in my opinion)
您可以采用两种方法： CoffeeScript 的最佳“字面”翻译是（在我看来）
req = $.get('foo.htm')
.success((response) ->
# do something
)
.error( ->
# do something
)
The other approach is to move the inline functions "outline," a style that Jeremy Ashkenas (the creator of CoffeeScript) generally favors for non-trivial function arguments:
另一种方法是移动内联函数“大纲”，Jeremy Ashkenas（CoffeeScript 的创建者）通常喜欢这种风格，用于非平凡的函数参数：
onSuccess = (response) ->
# doSomething
onError = ->
# doSomething
req = $.get('foo.htm').success(onSuccess).error(onError)
The latter approach tends to be more readable when the successand errorcallbacks are several lines long; the former is great if they're just 1-2 liners.
当success和error回调有几行长时，后一种方法往往更具可读性；前者很好，如果它们只是 1-2 个衬垫。
回答by Amir
I sometimes prefer having fewer parentheses as opposed to chaining, so I'd modify Trevor's last example:
有时我更喜欢使用更少的括号而不是链接，所以我会修改 Trevor 的最后一个例子：
req = $.get 'foo.htm'
req.success (response) -> # do something
req.error -> # do something
回答by Ben McCormick
As of Coffeescript 1.7, chaining has been significantly simplified, and you shouldn't need any of the parens-related workarounds mentioned here. Your above example can now be written as
从 Coffeescript 1.7 开始，链接已经得到显着简化，您不需要这里提到的任何与括号相关的解决方法。你上面的例子现在可以写成
req = $.get 'foo.htm'
.success ( response ) ->
alert "success"
.error ->
alert "error"
Which compiles to
编译成
var req;
req = $.get('foo.htm').success(function(response) {
return alert("success");
}).error(function() {
return alert("error");
});
You can see an explanation of this and other CS 1.7 features here: https://gist.github.com/aseemk/8637896
您可以在此处查看此功能和其他 CS 1.7 功能的说明：https: //gist.github.com/aseemk/8637896
