Javascript implements three methods for string inversion

2020-03-29 23:57:31
OfStack

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>