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// requestAnimationFrameを優先に、存在しなければsetTimeoutを取得する
var requestAnimationFrame = window.requestAnimationFrame
                            || window.webkitRequestAnimationFrame
                            || window.mozRequestAnimationFrame
                            || window.setTimeout;
window.requestAnimationFrame = requestAnimationFrame;

function func() {
    // 実行させたい何か
}

requestAnimationFrame( func, interval ); // intervalはsetTimeoutの時だけ利用されます