Shuffle an array with the Fisher–Yates shuffle in javascript

shuffle.js

function shuffle( a ) {
    var m = a.length, t, i;

    while ( m ) {
        i = Math.floor( Math.random() * m-- );
        t = a[ m ];
        a[ m ] = a[ i ];
        a[ i ] = t;
    }

    return a;
}

shuffle( [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ] );