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基本上我所做的是製作一個簡單的動畫,在按住回車鍵的同時將矩形移動到x軸。這工作正常,但問題是,當你按下回車鍵的矩形似乎跳轉向前約10px左右。不知道是什麼原因造成的。HTML5/Javascript - 爲什麼我的動畫首次啓動時跳起
//event listener
window.addEventListener("keydown", onKeyDown, false);
window.addEventListener("keyup", onKeyUp, false);
function onKeyDown(event){
var keyCode = event.keyCode;
switch(keyCode){
case 13: //enter
key = true;
break;
}
}
function onKeyUp(event){
var keyCode = event.keyCode;
switch(keyCode){
case 13: //enter
key = false;
break;
}
}
//neccessary variables
var tick = 0;
var key = false;
//main animation function
function drawStuff(){
window.requestAnimationFrame(drawStuff);
var canvas = document.getElementById("myCanvas");
var c = canvas.getContext("2d");
if(key == true){
c.clearRect(0,0,500,500);
c.fillStyle = "blue";
c.fillRect(tick,0,100,100);
}
else{
}
tick++;
}
window.requestAnimationFrame(drawStuff);
任何幫助表示讚賞!
啊。現在完美運作。非常感謝! – EpicPineapple