语法：
{ (parameters) ->return type in statements}
实例：采用函数实现：
let names =["Chris", "Alex", "Ewa", "Barry", "Daniella"]
funcbackwards(s1: String, s2: String) -> Bool {
return s1 > s2
}
var reversed = sort(names, backwards)
println(reversed)
//sort 排序函数，backwards 通过排序规则的函数 采用闭包实现：
var reversed = sort(names, { (s1: String, s2: String) -> Bool in
return s1 > s2
})
println(reversed)
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