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Inspired by Paul Irish's some short introduction into Performance Memory and Timing API in Google Chrome - http://www.youtube.com/watch?feature=player_profilepage&v=MllBwuHbWMY - ( Performance Timing is also available in Firefox) I created a simple object Forebone.Performance in Forebone.js library. First of all, I will create methods to wrap al…
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| // for now supports both only in Chrome | |
| if (typeof performance.memory == "object" && | |
| typeof performance.timing == "object") { | |
| /** | |
| * Forebone.Performance - wrapper for performance.timing | |
| * and performance.memory | |
| */ | |
| Forebone.Performance = { | |
| // memory functions | |
| getHeapSize : function() { | |
| return performance.memory.totalJSHeapSize; | |
| }, | |
| getHeapSizeLimit : function() { | |
| return performance.memory.jsHeapSizeLimit; | |
| }, | |
| getHeapSizeUsed : function() { | |
| return performance.memory.usedJSHeapSize; | |
| }, | |
| getHeapSizeStat : function() { | |
| return (( this.getHeapSizeUsed() * 100 ) / this.getHeapSizeLimit()).toFixed(2); | |
| }, | |
| // timing functions | |
| getTiming : function() { | |
| var start = this.getNavigationStart(); | |
| var str = "Performance timing flow: "; | |
| str += "\ndomLoading: " + (this.getDomLoading()-start) + " ms."; | |
| return str; | |
| }, | |
| getNavigationStart : function() { | |
| return performance.timing.navigationStart; | |
| }, | |
| getDomLoading : function() { | |
| return performance.timing.domLoading; | |
| }, | |
| getDomComplete : function() { | |
| return performance.timing.domComplete; | |
| } | |
| }; | |
| } else { | |
| Forebone.Performance = {}; | |
| } |
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| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Forebone.Window example</title> | |
| <script src="../lib/forebone.js"></script> | |
| </head> | |
| <body> | |
| <script> | |
| // sample usage | |
| var Debug = Forebone.Performance; | |
| console.log( Debug.getHeapSizeUsage() ); | |
| console.log( Debug.getTiming() ); | |
| /* output in Google Chrome console: | |
| JavaScript memory heap usage: 1.26% ForebonePerformance.html:12 | |
| Performance timing flow: | |
| domLoading: 8 ms. ForebonePerformance.html:13 | |
| */ | |
| </script> | |
| </body> | |
| </html> |
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