SOURCE

//原数组
var arr = [ 01, 27, 12, 03, 05, 15, 09, 10 ,24];
//输出数组
var out = [];
//输出个数
var num = 7;
while(out.length < num){
    var temp = (Math.random()*arr.length) >> 0;
    out.push(arr.splice(temp,1));
}
alert(out)