如何僅使用Javascript一次顯示一個數組元素？

Question

我做了一個JavaScript數組隨機化器，它每次間隔顯示一個元素。 我想讓他們一次顯示一個沒有間隔但有按鈕的顯示。 當我單擊按鈕時，它將切換到下一個元素，但是直到那時它仍保持不變。 你能幫我嗎？

 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> 

我不知道您的情況，但是如果您只想在每次按下按鈕時顯示一個數組中的隨機元素，則應該以一種更加簡單的方式來完成，而不必重新排列數組。

 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> 

要以隨機順序顯示值，以免重復出現，請使用以下代碼：

 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>