Javascript中没有欺骗的随机数生成器? [英] Random number generator without dupes in Javascript?

问题描述

我需要帮助编写一些代码，这些代码将从 12 个数字的数组中创建一个随机数并打印 9 次而不会被欺骗.这对我来说很难完成.有什么想法吗?

I need help with writing some code that will create a random number from an array of 12 numbers and print it 9 times without dupes. This has been tough for me to accomplish. Any ideas?

推荐答案

var nums = [1,2,3,4,5,6,7,8,9,10,11,12];
var gen_nums = [];

function in_array(array, el) {
   for(var i = 0 ; i < array.length; i++) 
       if(array[i] == el) return true;
   return false;
}

function get_rand(array) {
    var rand = array[Math.floor(Math.random()*array.length)];
    if(!in_array(gen_nums, rand)) {
       gen_nums.push(rand); 
       return rand;
    }
    return get_rand(array);
}

for(var i = 0; i < 9; i++) {
    document.write(get_rand(nums));
}

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