javascript 計算執行時間

form http://blog.longwin.com.tw/2008/07/get-javascript-function-exec-time-2008/



<script type="text/javascript">
var start = new Date().getTime();
{
    // do something.
}
var end = new Date().getTime();

// 計算花多久時間
document.write((end - start) / 1000 + "sec");
</script>