你需要讓另一個(gè)對(duì)象處理你自己的可執(zhí)行的代碼。
使用 Command pattern 傳遞函數(shù)的引用。
# Using a private variable to simulate external scripts or modules
incrementers = (() ->
privateVar = 0
singleIncrementer = () ->
privateVar += 1
doubleIncrementer = () ->
privateVar += 2
commands =
single: singleIncrementer
double: doubleIncrementer
value: -> privateVar
)()
class RunsAll
constructor: (@commands...) ->
run: -> command() for command in @commands
runner = new RunsAll(incrementers.single, incrementers.double, incrementers.single, incrementers.double)
runner.run()
incrementers.value() # => 6
以函數(shù)作為一級(jí)的對(duì)象且從 Javascript 函數(shù)的變量范圍中繼承,CoffeeScript 使語(yǔ)言模式幾乎看不出來(lái)。事實(shí)上,任何函數(shù)傳遞回調(diào)函數(shù)可以作為一個(gè)命令。
jqXHR 對(duì)象返回 jQuery AJAX 方法使用此模式。
jqxhr = $.ajax
url: "/"
logMessages = ""
jqxhr.success -> logMessages += "Success!\n"
jqxhr.error -> logMessages += "Error!\n"
jqxhr.complete -> logMessages += "Completed!\n"
# On a valid AJAX request:
# logMessages == "Success!\nCompleted!\n"