bc518174
 王天杨
提交两个项目文件
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function safeRequestAnimationFrame(callback) {
if (typeof requestAnimationFrame !== 'undefined') requestAnimationFrame(callback);
}
export default function setRafTimeout(callback, timeout = 0) {
let currTime = -1;
const shouldUpdate = now => {
if (currTime < 0) {
currTime = now;
}
if (now - currTime > timeout) {
callback(now);
currTime = -1;
} else {
safeRequestAnimationFrame(shouldUpdate);
}
};
requestAnimationFrame(shouldUpdate);
}
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