取消動畫

要取消對 requestAnimationFrame 的呼叫，你需要從上次呼叫時返回的 ID。這是你用於 cancelAnimationFrame 的引數。以下示例啟動一些假設動畫，然後在一秒鐘後暫停它。

// stores the id returned from each call to requestAnimationFrame
var requestId;

// draw something
function draw(timestamp) {
    // do some animation
    // request next frame
    start();
}

// pauses the animation
function pause() {
    // pass in the id returned from the last call to requestAnimationFrame
    cancelAnimationFrame(requestId);
}

// begin the animation
function start() {
    // store the id returned from requestAnimationFrame
    requestId = requestAnimationFrame(draw);
}

// begin now
start();

// after a second, pause the animation
setTimeout(pause,1000);