1、老方法
var?result?=?[]
function?unfold(arr){
?????for(var?i=0;i<?arr.length;i++){
??????if(arr[i] instanceof Array)?{
???????unfold(arr[i]);
?????}?else?{????????
???????result.push(arr[i]);
?????}
??}
}
var?arr?=?[1,3,4,5,[6,[0,1,5],9],[2,5,[1,5]],[5]];
unfold(arr)
2烟馅、使用tostring
var?c=[1,3,4,5,[6,[0,1,5],9],[2,5,[1,5]],[5]];
var?b?=?c.toString().split(',')
3粥诫、使用es6的reduce函數(shù)
var?arr=[1,3,4,5,[6,[0,1,5],9],[2,5,[1,5]],[5]];
const?flatten?=?arr?=>?arr.reduce((a,?b)?=>?a.concat(Array.isArray(b)???flatten(b)?:?b),?[]);
var?result?=?flatten(arr)
