Javascript 无背对背的随机报价

我试图从数组中随机抽取一个引号。我需要显示一个初始报价，然后得到一个新的报价，没有相同的两个报价背靠背。这是我得到的

$(document).ready(function() {

    var quoter = [{
    quote: "I drink to make other people more interesting.",
    author: "Ernest Hemingway"
}, {
    quote: "Alcohol may be man's worst enemy, but the bible says love your enemy.",
    author: "Frank Sinatra"
}, {
    quote: "Reality is an illusion created by a lack of alcohol.",
    author: "N.F. Simpson"
},{
    quote: "Time is never wasted when you’re wasted all the time.",
    author: "Catherine Zandonella"
},{
    quote: "I feel bad for people who don’t drink. When they wake up in the morning, that’s as good as they’re going to feel all day.",
    author: "Frank Sinatra"    
}];

    var randomQuote = Math.floor(Math.random() * quoter.length);
//$(function () {
    //Set Original Quote
    $('#quoteText').text(quoter[randomQuote].quote);
    $('#authorText').text(quoter[randomQuote].author);      
//});       

  $('#btnNew').click(function(evt) {
    //prevent browser's default action
    evt.preventDefault();
    //getting a new random number to attach to a quote and setting a limit
    var sourceLength = quoter.length;
    var randomNumber = Math.floor(Math.random() * sourceLength);


    //set a new quote
    //while ( randomNumber <= sourceLength ) {
        while (randomNumber === randomNumber){
      var newQuoteText = quoter[randomNumber].quote;
      var newQuoteGenius = quoter[randomNumber].author;

      var timeAnimation = 500;
      var quoteContainer = $('#quoteContainer');
      //fade out animation with callback
      quoteContainer.fadeOut(timeAnimation, function() {

        //set text values
        $('#quoteText').text(newQuoteText);
        $('#authorText').text(newQuoteGenius);

        //console.log(quoteText,authorText);

        //fadein animation.
        quoteContainer.fadeIn(timeAnimation);
      });

      break;

    }; //end while loop

  }); //end btnNew function

}); //end document ready

$（文档）.ready（函数（）{
变量报价器=[{
引用：“我喝酒是为了让别人更有趣。”，
作者：“欧内斯特·海明威”
}, {
引用：“酒精可能是人类最大的敌人，但圣经上说爱你的敌人。”，
作者：“弗兰克·西纳特拉”
}, {
引用：“现实是一种因缺乏酒精而产生的幻觉。”，
作者：“N.F.辛普森”
},{
引用：“当你一直在浪费时间的时候，时间永远不会被浪费。”，
作者：“凯瑟琳·赞多内拉”
},{
引用：“我为那些不喝酒的人感到难过。当他们早上醒来时，这和他们一整天的感觉一样好。”，
作者：“弗兰克·西纳特拉”
}];
var randomQuote=Math.floor（Math.random（）*quoter.length）；
//$（函数（）{
//设置原始报价
$（'quoteText'）.text（quoter[randomQuote].quote）；
$（'authorText'）.text（引号[randomQuote].author）；
//});       
$（'#btnNew'）。单击（函数（evt）{
//阻止浏览器的默认操作
evt.preventDefault（）；
//获取要附加到报价的新随机数并设置限制
var sourceLength=quoter.length；
var randomNumber=Math.floor（Math.random（）*sourceLength）；
//设定新报价
//while（randomNumber您可以让一个简单的变量存储以前的值，然后检查随机数是否与上次相同

$(document).ready(function(){
    //....your current above code

    var lastQuote = randomQuote;

    $(button).click(function(){
        var thisQuote = Math.floor(Math.random() * sourceLength);

        //This will only be entered if the two are equal
        //The while loop ensures that if you get a new random number
        //it won't be the same
        while(thisQuote == lastQuote){
            thisQuote = Math.floor(Math.random() * sourceLength);
        }

        //If you make it here a unique number has been found
        lastQuote = thisQuote;    
    }); 
});

您的方法可能会导致无限循环。不会发生，因为随机数生成器并不完美，但可以更轻松地完成：

或者线性向下（或者如果你愿意，可以构造一个幻觉），或者删除已经显示的每个引号。
为什么不简单地保留从随机数生成器中获得的索引值并进行比较呢？如果（newNum==oldNum）reroll；var rand=myArray[Math.floor（Math.random（）*myArray.length）]；@mhodges我不知道该怎么做，谢谢@Vasim，但我不太明白，这是完全正确的。我不想写代码；）
$(document).ready(function(){
    //....your current above code

    var lastQuote = randomQuote;

    $(button).click(function(){
        var thisQuote = Math.floor(Math.random() * sourceLength);

        //This will only be entered if the two are equal
        //The while loop ensures that if you get a new random number
        //it won't be the same
        while(thisQuote == lastQuote){
            thisQuote = Math.floor(Math.random() * sourceLength);
        }

        //If you make it here a unique number has been found
        lastQuote = thisQuote;    
    }); 
});