[英]jQuery .show() not working as intended. hides well but does not show
[英]Keydown event not working as intended. Image is staying still?
我在這里有一張圖片,它位於 canvas 中,但是按下指定的鍵不會導致任何事情發生。 我的代碼 go 哪里錯了?
let img = document.getElementById("ship");
let player = {
x: 375,
y: 550,
w: 50,
h: 50,
};
requestAnimationFrame(draw);
function draw() {
//Logic
ctx.drawImage(img, player.x, player.y, player.w, player.h);
//Draw
ctx.clearRect(0, 0, cnv.width, cnv.height);
requestAnimationFrame(draw);
}
document.addEventListener("keydown", move);
function move(event) {
console.log(event.code);
if (event.code === 39) {
player.x = player.x + 50;
} else if (event.code === 37) {
player.x = player.x - 50;
} else if (event.code === 40) {
player.x = player.y - 50;
} else if (event.code === 38) {
player.x = player.y + 50;
}
}
event.code
的類型是 DOMString 而不是event.keyCode
的數字。
例如:按左箭頭將驗證event.keyCode === 37
和event.code === 'ArrowLeft'
。
將code
更改為keyCode
或您檢查event.code
的值,您應該對 go 很好:)
干杯!
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