本文介绍了Javascript中的按键监听器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我正在为我正在用 JavaScript 开发的游戏寻找 KeyListener.我不知道这在实际代码中是如何工作的，但它会是这样的:
I'm looking for a KeyListener for a game I'm developing in JavaScript. I have no idea how this would work in real code but it would be something like this:
if(keyPress == upKey)
{
playerSpriteX += 10;
}
else if(keyPress == downKey)
{
playerSpriteY -= 10;
}
等等……
我搜索了一下，Google 想出了一些我还不了解的涉及 AJAX 的东西.JavaScript 中是否有内置函数可以执行此操作?
I searched it up, and Google came up with things that involved AJAX which I don't understand yet. Is there a built in function in JavaScript that does this?
推荐答案
这是 2019 年现代浏览器的更新
Here's an update for modern browsers in 2019
let playerSpriteX = 0;
document.addEventListener('keyup', (e) => {
if (e.code === "ArrowUp") playerSpriteX += 10
else if (e.code === "ArrowDown") playerSpriteX -= 10
document.getElementById('test').innerHTML = 'playerSpriteX = ' + playerSpriteX;
});Click on this window to focus it, and hit keys up and down
<br><br><br>
<div id="test">playerSpriteX = 0</div>2013 年的原始答案
Original answer from 2013
window.onkeyup = function(e) {
var key = e.keyCode ? e.keyCode : e.which;
if (key == 38) {
playerSpriteX += 10;
}else if (key == 40) {
playerSpriteX -= 10;
}
}
FIDDLE
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