during this [question](https://stackoverflow.com/questions/8199473/how-do-you-call-a-less-js-function) i want to call some less functions such as darken, lighten and spin inside javascript. i did it in node.js like this and it works:

```
#!/usr/bin/env node
var less = require('less');
var args = process.argv.slice(2);

less.render(".my{ color:lighten("+ args[0]+","+args[1]+"%); }", function (e, css) {
     console.log(css.match(/\#[0-9a-fA-F]+/)[0]);
});

```

this is output:

```
$ ./my "#000" 13.5
#222222

```

but i did in html and less.js file and using solution in this [question](https://stackoverflow.com/questions/8199473/how-do-you-call-a-less-js-function) and made this:

```
<html>
<head>
    <title></title>
    <script language="JavaScript" src="less-1.7.0.min.js"></script>
    <script language="JavaScript">
        var lessColor = {
            /*
             |--------------------------------------------------------------------------
             | Lighten
             |--------------------------------------------------------------------------
             */
            lighten: function (col, val) {
                col = col.replace(/#/g, '');    //Remove the hash

                var color = new less.tree.Color(col);   //Create a new color object
                var amount = new less.tree.Value(val);      //Create a new amount object
                var newRGB = less.tree.functions.lighten(color, amount); //Get the new color
                var hex = (newRGB.rgb[0] + 256 * newRGB.rgb[1] + 65536 * newRGB.rgb[2]).toString(16);
                hex = hex.split('.', 1);    //Remove everything after the decimal if it exists

                //Add padding to the hex to make it 6 characters
                while (hex.length < 6) {
                    hex = hex + '0';
                }
                hex = '#' + hex;  //Add the hash

                return hex; //return the color
            }
        };
        console.log(lessColor.lighten("#000",13.5));
    </script>
</head>
<body>
</body>
</html>

```

but different output in console:
![enter image description here](https://i.stack.imgur.com/ZLFXF.jpg)

i'm pretty sure #222222 is correct result but how can i get this result inside javascript?