js中将数组中的数字进行翻转

var sum = new Array(10,20,30,40,50,60,70)
for(var i=0; i<sum.length/2; i++){
var temp
temp = sum[i]
sum[i]=sum[sum.length-1-i]
sum[sum.length-1-i]=temp

} console.log(sum) document.write(sum)