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| isRequestAnimationFrame() {
let lastTime = 0;
let vendors = ['webkit', 'moz'];
for (let i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
window.requestAnimationFrame = window[vendors[i] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[i] + 'CancelAnimationFrame'] || window[vendors[i] + 'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = function (callback, element) {
let currTime = new Date().getTime();
let timeToCall = Math.max(0, 16.7 - (currTime - lastTime));
let id = window.setTimeout(function () {
callback(currTime + timeToCall);
}, timeToCall);
lastTime = currTime + timeToCall;
return id;
}
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = function (id) {
clearTimeout(id);
};
}
}
|
