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) {
var timeout = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
var currTime = -1;
var shouldUpdate = function shouldUpdate(now) {
if (currTime < 0) {
currTime = now;
}
if (now - currTime > timeout) {
callback(now);
currTime = -1;
} else {
safeRequestAnimationFrame(shouldUpdate);
}
};
requestAnimationFrame(shouldUpdate);
}
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