<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>day2</title>
<script>
function reverseArr(arr1){
var resultArr=[];
var arr1_len=arr1&&arr1.length||0;
for(var i=0;i< arr1_len;i++){
resultArr.push(arr1[arr1_len-i-1]);
}
return resultArr;
};
var a=[3,5,8,1];
var b=reverseArr(a);
document.write(b);
</script>
</head>
<body>
</body>
</html>