timer to see how fast some code run javascript code example
Example 1: Javascript measure function run time
var startTime = performance.now();
alert('Run some function here');
var endTime = performance.now();
var totalTime=endTime-startTime;// time took to run in milliseconds
alert('Total time:'+totalTime +'ms');
Example 2: javascript count time
var start = new Date().getTime();
for (i = 0; i < 50000; ++i) {
// do something
}
var end = new Date().getTime();
var time = end - start;
alert('Execution time: ' + time);