如何仅使用Javascript一次显示一个数组元素？

Question

我做了一个JavaScript数组随机化器，它每次间隔显示一个元素。 我想让他们一次显示一个没有间隔但有按钮的显示。 当我单击按钮时，它将切换到下一个元素，但是直到那时它仍保持不变。 你能帮我吗？

 var numberStrings = ["One", "Two", "Three", "Four", "Five", "Six"]; var i = 0; setInterval(function() { document .getElementById('numberList') .innerHTML = numberStrings[i++]; if (i == numberStrings.length) i = 0; }, 2000); function shuffleUsingRandomSwapping(array) { var j, x, i = 0, len = array.length; for (i; i < len; i++) { j = Math.floor(Math.random() * len); x = array[i]; array[i] = array[j]; array[j] = x; } } 

 <button onclick="shuffleUsingRandomSwapping(numberStrings);updateNumberList(numberStrings);">Shuffle Using Random Swapping</button> <div id="numberList"></div> 

Answer 1

 var numberStrings = ["One", "Two", "Three", "Four", "Five", "Six"]; var curElement = 0; function updateNumberList() { document .getElementById('numberList') .innerHTML = numberStrings[curElement++]; if (curElement == numberStrings.length) curElement = 0; } function shuffleUsingRandomSwapping(array) { var j, x, i = 0, len = array.length; for (i; i < len; i++) { j = Math.floor(Math.random() * len); x = array[i]; array[i] = array[j]; array[j] = x; } } 

 <button onclick="shuffleUsingRandomSwapping(numberStrings);updateNumberList(numberStrings);">Shuffle Using Random Swapping</button> <div id="numberList"></div> 

我不知道您的情况，但是如果您只想在每次按下按钮时显示一个数组中的随机元素，则应该以一种更加简单的方式来完成，而不必重新排列数组。

 var numberStrings = ["One", "Two", "Three", "Four", "Five", "Six"]; function displayRandomElem() { document .getElementById('numberList') .innerHTML = numberStrings[Math.floor(Math.random() * numberStrings.length)]; } 

 <button onclick="displayRandomElem()">Shuffle Using Random Swapping</button> <div id="numberList"></div> 

要以随机顺序显示值，以免重复出现，请使用以下代码：

 var numberStrings = ["One", "Two", "Three", "Four", "Five", "Six"]; function displayRandomElem() { if (numberStrings.length == 0) return; document .getElementById('numberList') .innerHTML = numberStrings.splice(Math.floor(Math.random() * numberStrings.length), 1); } 

 <button onclick="displayRandomElem()">Shuffle Using Random Swapping</button> <div id="numberList"></div>