function getRandomArrayElements(arr, count) {
    var shuffled = arr.slice(0), i = arr.length, min = i - count, temp, index;
    while (i-- > min) {
        index = Math.floor((i + 1) * Math.random());
        temp = shuffled[index];
        shuffled[index] = shuffled[i];
        shuffled[i] = temp;
    }
    
 
return shuffled.slice(min);
}

var items = [‘1‘,‘2‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘,‘10‘,"11","12","13","14","15"];

console.log( getRandomArrayElements(items, 10) );

javaScript從數組裏隨機抽取10個值