通读一遍this http://jashkenas.github.com/coffee-script/，我谈到了函数参数的默认值：
fill = (container, liquid = "coffee") ->
"Filling the #{container} with #{liquid}..."
这很简洁，但后来我尝试了这个：
fill = (container="mug", liquid = "coffee") ->
"Filling the #{container} with #{liquid}..."
alert fill(liquid="juice")
并得到了意外的警报"Filling the juice with coffee..."。然后我尝试了这个：
fill = (container="mug", liquid = "coffee") ->
"Filling the #{container} with #{liquid}..."
alert fill(null, "juice")
它起作用了。但它并不漂亮。有没有更好的方法，或者这是执行此操作的惯用方法？
fill = ({container, liquid} = {}) ->
container ?= "mug"
liquid ?= "coffee"
"Filling the #{container} with #{liquid}..."
alert fill(liquid: "juice", container: "glass")
alert fill()
fill = (quantity="500 mL", {container, liquid} = {}) ->
container ?= "mug"
liquid ?= "coffee"
"Filling the #{container} with #{quantity} of #{liquid}..."
alert fill("1L", liquid: "juice", container: "glass")
alert fill()
alert fill "1L"
alert fill "1L", liquid: "water"
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