数组求和

var a =[1,2,3,4,5]; var b =0; for(var i=0;i<a.length;i++){ // b=a[i]+b; //和下面的写法等同 b+=a[i] } console.log(b) //15

 

转载于:https://www.cnblogs.com/7-Eleven/p/5662016.html