Usually we need to optimize the function, the general practice is to get the time at the beginning, the end of the time to get a second, two times to subtract time to the time to spend. And the function runs fast, basically is the millisecond level.
The function given below is intended for this purpose.
Time to timestamp (milliseconds)
function Time2stamp () {
var d = new Date ();
Return Date.parse (d) +d.getmilliseconds ();
}
Usage:
var T1 = Time2stamp ();
Compares the DOM running speed of each viewer.
var divs = document.getelementbytagname ("div");
var t2 = Time2stamp ();
Alert ("Time Consuming:" + (T2-T1) + "millisecond");
The New approach:
var time1 = new Date
//Compare DOM run speed of each viewer.
var divs = document.getelementbytagname ("div");
Alert ("Time Consuming:" + (new date-time1) + "millisecond");
Test the efficiency of various loops, for...in such a slow cycle on the contingency!
<!doctype html>
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