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我正在製作一個JavaScript帆布遊戲,並且我需要檢測設備上的觸摸屏是否被扣下來以便輕拍。我有工作去接觸,但我不知道如何在按住時調用方法。正在按下JavaScript過程設備觸摸屏
所以我添加事件handelers
function addTouchEventHandlers()
{
screen.canvas.addEventListener('touchstart', touchStart);
screen.canvas.addEventListener('touchend', touchEnd);
}
我有觸摸開始和觸摸結束
function touchStart(e) {
if (gameStarted) {
// Prevent players from inadvertently
// dragging the game canvas
e.preventDefault();
}};
function touchEnd(e) {
var x = e.changedTouches[0].pageX;
var y = e.changedTouches[0].pageY;
if (gameStarted) {
if (x > screen.width/2)
{
processRightTap();
}
else if (x < screen.width/2 && y < screen.height/2)
{
processTopLeftTap(); <- I want to keep calling this method when held down
}
else if (x < screen.width/2 && y > screen.height/2)
{
processBottomLeftTap(); <- I want to keep calling this method when held down
}
// Prevent players from double
// tapping to zoom into the canvas
e.preventDefault();
}
};
方法只需改變我的精靈y位置
function processBottomLeftTap() {
ship.y += 4;
}
function processTopLeftTap() {
ship.y -= 4;
}
是他們類似於鍵盤方法isPressed和isDown的東西嗎? 或者我將如何創建一個圍繞該方法的while循環? 這樣的事情。
while(The screen is being touched at X position)
{
processTopLeftTap();
}