如何解决窗口 addEventListener 按键不起作用
我正在编写一个游戏，当您按下箭头键时，立方体会在屏幕上移动。但它不起作用。有人可以帮我吗？
var playerElement = document.getElementById('playerEl');
var playerY = 0;
var playerX = 0;
window.addEventListener('keydown',function(e) {
switch (e.keyCode) {
case 37:
playerX -= 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%);";
break;
case 38:
playerY -= 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%);";
break;
case 39:
playerX += 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%);";
break;
case 40:
playerY += 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%);";
break;
}
},true);#playerEl {
width: 50px;
height: 50px;
background: grey;
display: inline-block;
transform: translate(1%,1%);
}<body style="height:100vh;width:100vw;">
<div id="playerEl"></div>
</body>解决方法
使用 javascript 设置 transform style 属性时，不必在字符串中添加 ;。
应该这样做：
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%)";
这是您的代码，; 字符串中没有 transform。
var playerElement = document.getElementById('playerEl');
var playerY = 0;
var playerX = 0;
window.addEventListener('keydown',function(e) {
switch (e.keyCode) {
case 37:
playerX -= 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%)"; // Removed semi-colon from string
break;
case 38:
playerY -= 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%)"; // Removed semi-colon from string
break;
case 39:
playerX += 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%)"; // Removed semi-colon from string
break;
case 40:
playerY += 100;
playerElement.style.transform = "translate(" + playerX + '%,' + playerY + "%)"; // Removed semi-colon from string
break;
}
},true);#playerEl {
width: 50px;
height: 50px;
background: grey;
display: inline-block;
transform: translate(1%,1%);
}<body style="height:100vh;width:100vw;">
<div id="playerEl"></div>
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