<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<!--不使用for求某个数组前十个元素之和-->
<script type="text/javascript">
var arr=[1,2,3,4,5,5,4,3,2,1,0];
/* 法1
var sum=arr.slice(0,10).reduce(function (pre,cur) {
return pre+cur;
});
console.log(sum);
*/
//法2：递归
var i=0;
function sum(arr,n) {
if(i===n) {
return 0;
}else{
console.log(arr[i])
return arr[i++]+sum(arr,n);
}
}
var sum1=sum(arr,10)
console.log(sum1);
</script>
</body>
</html>