Compute elapsed time [duplicate]

Answer 1

Try this...

function Test()
{
    var s1 = new StopWatch();

    s1.Start();        

    // Do something.

    s1.Stop();

    alert( s1.ElapsedMilliseconds );
} 

// Create a stopwatch "class." 
StopWatch = function()
{
    this.StartMilliseconds = 0;
    this.ElapsedMilliseconds = 0;
}  

StopWatch.prototype.Start = function()
{
    this.StartMilliseconds = new Date().getTime();
}

StopWatch.prototype.Stop = function()
{
    this.ElapsedMilliseconds = new Date().getTime() - this.StartMilliseconds;
}