1.return 的巧妙利用 省略else 代碼塊
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function people(){
if(input==0){
genter = 'woman'
}else if(input==1){
genter ='man'
}else{
genter ='unknow'
}
}
function _people(){
if(input == 0)return 'woman'
if(input == 1) return 'man'
return 'unknow'
}
var genter,input=3;
people(input)
console.log(genter) //'unknow'
genter=_people(input)
console.log(genter)//'unknow'
明顯：_people() 代碼整潔與people()
