JavaScript Random Numbers

rand.js

function rand( min, max ) {
    var seed = Math.random();
    if( typeof min != 'number' && typeof max != 'number' ) { 
        return seed; // default is just random
    } else if( typeof min == 'number' && typeof max != 'number' ) {
        return Math.round( seed * min );
    } return Math.floor( seed * max ) + min;
}

//
// Test body
//
console.log = function( x ) {
    document.body.innerHTML += "<pre>" + JSON.stringify( x ) + "</pre>";
}

console.log( rand() )
console.log( rand() )
console.log( rand() )
console.log( rand() )
console.log( rand() )
console.log( rand() )


console.log( rand( 5 ) )
console.log( rand( 5 ) )
console.log( rand( 5 ) )
console.log( rand( 5 ) )
console.log( rand( 5 ) )
console.log( rand( 5 ) )


console.log( rand( 1, 10 ) )
console.log( rand( 1, 10 ) )
console.log( rand( 1, 10 ) )
console.log( rand( 1, 10 ) )
console.log( rand( 1000, 9999 ) )