- A+
所属分类:javascript
(function(root){
var vendors = ['moz', 'o', 'webkit', 'ms'], lastTime = 0;
for(var i = 0, len = vendors.length; i < len && !root.requestAnimationFrame; i++){
root.requestAnimationFrame = root[vendors[i] + 'RequestAnimationFrame'];
root.cancelAnimationFrame = root[vendors[i] + 'CancelRequestAnimationFrame']
}
if(!root.requestAnimationFrame){
root.requestAnimationFrame = function(callback){
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = root.setTimeout(function(){callback(currTime + timeToCall)}, timeToCall);
return id;
}
}
if(!root.cancelAnimationFrame){
root.cancelAnimationFrame = clearTimeout;
}
})(window)

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