缓动函数requestAnimationFrame更好的实现浏览器经动画_基础知识

代码如下:

function callback(time) {
window.mozRequestAnimationFrame(callback);
doWork();
}

代码如下:

function animate(element, name, from, to, time) {
time = time || 800; //默认0.8秒
var style = element.style,
latency = 60, // 每60ms一次变化
count = time / latency, //变化的次数
step = Math.round((to - from) / count), //每一步的变化量
now = from;
function go() {
count--;
now = count ? now + step : to;
style[name] = now + 'px';
if (count) {
setTimeout(go, latency);
}
}
style[name] = from + 'px';
setTimeout(go, latency);
}

代码如下:

function animate(element, name, from, to, time) {
time = time || 800; // 默认0.8秒
var style = element.style,
startTime = new Date;
function go(timestamp) {
var progress = timestamp - startTime;
if (progress >= duration) {
style[name] = to + 'px';
return;
}
var now = (to - from) * (progress / duration);
style[name] = now.toFixed() + 'px';
requestAnimationFrame(go);
}
style[name] = from + 'px';
requestAnimationFrame(go);
}

代码如下:

requestAnimatiOnFrame= window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.msRequestAnimationFrame ||
window.oRequestAnimationFrame ||
function(callback) { setTimeout(callback, 1000 / 60); };