Monotonically increasing time in JavaScript?

Question

What’s the best way to get monotonically increasing time in JavaScript? I’m hoping for something like Java’s System.nanoTime().

Date() obvi

Answer 1

You could use window.performance.now() - since Firefox 15, and window.performance.webkitNow() - Chrome 20]

var a = window.performance.now();
//...
var delay = window.performance.now() - a;