efficency string operation

Because string is immutable in JavaScript, concatenation with array.join('') is much efficient. The following code use all the chinese characters. Click here to show

      var sb = [];
        sb[sb.length] = "
";
              
        for (var i = 0x4e00; i <= 0x9fcf; i++) {
            sb[sb.length] = String.fromCharCode(i);
        }
        sb[sb.length] = "
";
        $("#chinese").html(sb.join(""));
       return false;