我正在尝试从Awais Mirza的教程中修改此测验应用程序>
我想从主数组中随机选择问题,并将其推入脚本用来填充问题的选择数组,因此,每次测验为时,测验将从主数组中随机抽取一组问题跑。我以为我可以先使用Fisher-Yates随机播放将主数组随机化,然后再将选定数量的问题放入选择数组中。
为什么Fisher-Yates随机播放对此数组起作用;
var arr = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
var i = arr.length, j, temp;
while(--i > 0){
j = Math.floor(Math.random()*(i+1));
temp = arr[j];
arr[j] = arr[i];
arr[i] = temp;
}
console.log(arr);
但不包含此数组吗?
var Questions = [
new Question("What comes after 1?", ["1", "2","3", "4"], "2"),
new Question("What comes after 2?", ["1", "2", "3", "4"], "3"),
new Question("What comes after 3?", ["1", "2", "3", "4"], "4")
];
我正在尝试从Awais Mirza的教程中修改此测验应用程序,我想从主阵列中随机选择问题,并将其推入脚本用于...的选择阵列中。]