javascript

Javascript implements three methods for string inversion

The first way

var str = "abcdef";
console.log( str.split("").reverse().join("") ) ;

The second method:

var str="abcdef"
var i=str.length;
i=i-1;
for (var x = i; x >=0; x--)
{
document.write(str.charAt(x));
}

The third method:

<html>
<body>
<script>
function reverse(str)
{
    if(str.length == 0)return null;
    var i = str.length;
    var dstr = "";
    while(--i >= 0)
    {
        dstr += str.charAt(i); 
    }
    return dstr;
}
var str = "abcdef";
str = reverse(str);
document.write(str);
</script>
</body>
</html>