console 命令行工具 X clear

console

function Reverse(str)
{
var arr =[];
for(var i=str.length-1;i>=0;i--)
    {
          
        arr.push(str[i]);
    }
    return arr.join("");
}
document.write(Reverse('abcde'));
document.write("<br />");

<!DOCTYPE html>
<html>
<head>
    <meta charsrt="utf-8" />
    <title></title>
</head>
<body>
    <script>

    </script>
</body>
</html>