js生成兩個數之間的隨機數，0到99999之間的隨機數

//生成從minNum到maxNum的隨機數
function randomNum(minNum,maxNum){ 
    switch(arguments.length){ 
    case 1: 
            return parseInt(Math.random()*minNum+1,10); 
    break; 
    case 2: 
        return parseInt(Math.random()*(maxNum-minNum+1)+minNum,10); 
    break; 
        default: 
            return 0; 
        break; 
   } 
}