Created
August 22, 2012 14:27
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Performance.now() polyfill
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(function(w){ | |
var perfNow; | |
var perfNowNames = ['now', 'webkitNow', 'msNow', 'mozNow']; | |
if(!!w['performance']) for(var i = 0; i < perfNowNames.length; ++i) | |
{ | |
var n = perfNowNames[i]; | |
if(!!w['performance'][n]) | |
{ | |
perfNow = function(){return w['performance'][n]()}; | |
break; | |
} | |
} | |
if(!perfNow) | |
{ | |
perfNow = Date.now; | |
} | |
w.perfNow = perfNow; | |
})(window); | |
// Usage | |
console.log(window.perfNow()); |
+(new Date()) // this is a number
function now() { return +(new Date()); } // this is a function that returns a number
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Note that
Date.now()
doesn't exist in IE8, so you may also need to add something along the lines of: