JavaScript 生成随机数而不重复

问题描述

我有一些代码，其中包含 x 数量的项目.在这种情况下，视频，我想随机调用一个视频，但是如果当前已经调用的视频与随机数相同，我希望它生成另一个随机数，直到它是唯一的.

I have some code where I have an array of x amount of items. In this case, videos, and I want to randomly call a video, however if the current video already called is the same as the random number I want it to generate another random number until it's unique.

这是我的代码:

var videoLinks = [
    ['<iframe id="vid" src="https://www.youtube.com/embed/nYm2G4MnSkY?autoplay=1" frameborder="0" allowfullscreen></iframe>'],
    ['<iframe id="vid" src="https://www.youtube.com/embed/wAgZVLk6J4M?autoplay=1&start=5&end=45" frameborder="0" allowfullscreen></iframe>'],
    ['<iframe id="vid" src="https://www.youtube.com/embed/ix9wpslKwBE?autoplay=1" frameborder="0" allowfullscreen></iframe>'],
    ['<iframe id="vid" src="https://www.youtube.com/embed/OJJ-iLsQOPc?autoplay=1&iv_load_policy=3" frameborder="0" allowfullscreen></iframe>'],
    ['<iframe id="vid" src="https://www.youtube.com/embed/rore790l_sk?autoplay=1&start=12&end=94" frameborder="0" allowfullscreen></iframe>'],
];

var randomNumber = function () {
    var getRandomNumber = Math.floor(Math.random() * 5);
    var random = videoLinks[getRandomNumber]
    document.getElementById("videoWrapper").innerHTML = random[0];
};

randomNumber(); // To call the function on load

推荐答案

用一个变量来检查个数是否相同.

use a variable to check if the number is the same.

类似这样的:(使用 LastNumber 存储 lastNumber)如果它已经被使用，我们会再试一次)

something like this: (using LastNumber to store the lastNumber) if it allready is used we gonna try again)

var videoLinks = [
    ....
];

var lastNumber = 0;
var randomNumber = function () {
    var getRandomNumber = Math.floor(Math.random() * 5);  
    if(getRandomNumber != lastNumber){
        var random = videoLinks[getRandomNumber];
        document.getElementById("videoWrapper").innerHTML = random[0];
        lastNumber = getRandomNumber;
    }else{
        randomNumber();
    }
};

randomNumber(); // To call the function on load

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