1.不定參數(shù)
var myfn = function(...arg){console.log(arg)},對(duì)于這里的...arg是傳入不定個(gè)參數(shù)，在函數(shù)內(nèi)部的arg是個(gè)數(shù)組
不定參數(shù)
2.拓展參數(shù)
var arg = [10,12,34]
var myfn = function(x,y,z){console.log(x+y+z)} ; ??
myfn(...arg)//56
在這里將數(shù)組轉(zhuǎn)換成參數(shù)傳入
