每次单击按钮，都会生成一个唯一的随机数，范围为1-100-JavaScript [英] Every Time on a button click, generate a UNIQUE random number in a range of 1 - 100 - JavaScript

问题描述

我有一个功能.每次调用该函数时，它都应返回一个唯一值(小于100的随机数)(例如，如果我调用此函数90次，则应给出90个不同的数字).

I have a function. Every time I call the function, it should return a UNIQUE (for example, if I call this function 90 times, it should have given 90 different numbers) random number under 100.

我正在做

var randomNumber = Math.floor(Math.random() * 100);

但是，它没有返回唯一的数字.它只是返回随机数.

But, it's not returning unique numbers. It's only returning random numbers.

谢谢.

修改:呼叫100次后，它应该返回一些警报.

It should return some alert after calling 100 times.

推荐答案

使100个数字组成的数组会在每次您调用它时将选定的数字切掉:

Make an array of a 100 numbers an cut the chosen number out each time you call it:

var unique = (function() {                             // wrap everything in an IIFE
  var arr = [];                                        // the array that contains the possible values
  for(var i = 0; i < 100; i++)                         // fill it
    arr.push(i);
  
  return function() {                                  // return the function that returns random unique numbers
    if(!arr.length)                                    // if there is no more numbers in the array
      return alert("No more!");                        // alert and return undefined
    
    var rand = Math.floor(Math.random() * arr.length); // otherwise choose a random index from the array
    return arr.splice(rand, 1) [0];                    // cut out the number at that index and return it
  };
})();

console.log(unique());
console.log(unique());
console.log(unique());
console.log(unique());

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