測試js解釋定時的耗時(16ms)和拳套調用的最大次數

<div style="position:absolute ;" id="div" >5</div><script> var for_i = 0; var pre_t = 0; setInterval(function () { div.style.top = for_i++;//先top =for,再for++的,因爲=比++優先 var now_t = new Date().getTime()

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