window.requestAnimationFrame(drawFrame, canvas)

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{function drawFrame () {

window.requestAnimationFrame(drawFrame, canvas);

//animation code....

}()}


在不同浏览器中实现 

---------------------------------------------

if(!window.requestAnimationFrame) {

window.requestAnimationFrame = (window.webkitRequestAnimationFrame ||

                                                                        window.mozRequestAnimationFrame ||

window.msRequestAnimationFrame ||

function(callback) {

return window.setTimeout(callback, 1000/60);

}

}

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