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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>reveal.js - The HTML Presentation Framework</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/style.css" id="theme">
<!-- Code syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="theme-font-opensans theme-color-forest-yellow" style="width: 100%; height: 100%;">
<div class="reveal">
<div class="slides">
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 210px; height: auto;">
<div class="sl-block-content">
<h1>JavaScript Performance Optimizations</h1>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 900px; left: 30px; top: 58px; height: auto;">
<div class="sl-block-content" style="font-size: 200%; text-align: left;">
<h1>Why
<br/>
When
<br/>
What
</h1>
</div>
</div>
</section>
<section data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1620467/why.gif" data-background-size="cover"></section>
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 190px; height: auto;">
<div class="sl-block-content">
<h1>Why</h1>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 287px; height: auto;">
<div class="sl-block-content">
<h2>To achieve a balance between fast execution speed and small code size</h2>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 190px; height: auto;">
<div class="sl-block-content">
<h1>When</h1>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 287px; height: auto;">
<div class="sl-block-content">
<h2>After analysis! Don't jump to optimizations and don't over optimize</h2>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 190px; height: auto;">
<div class="sl-block-content" style="z-index: 10;">
<h1>How</h1>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 287px; height: auto;">
<div class="sl-block-content" style="z-index: 11;">
<h2>Strings, variables, functions...</h2>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 70px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<h2>Strings</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 144px; height: auto;">
<div class="sl-block-content" style="z-index: 12; text-align: left;">
<p>Concat (str+) vs arr.join</p>
</div>
</div>
<div class="sl-block" data-block-type="code" style="min-width: 30px; min-height: 30px; width: 496px; height: 448px; left: 439px; top: 78px;">
<div class="sl-block-content fragment" style="z-index: 14; border-width: 1px;" data-highlight-theme="xcode" data-fragment-index="0">
<pre class="javascript">
<code>//String concatenation
var myConcatString = "this is a string" +
"and I am another string" +
"together we make a bigger string";
//Array join
var myConcatString = ["this is a string",
"and I am another string",
"together we make a bigger string"].join();
</code></pre>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 130px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<h3>Experiment results</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 200px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 12;">
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Chrome, str+ vs. arr.join:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">
<strong>745M ops/sec</strong> vs. 21M ops/sec
</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">FF, str+ vs. arr.join:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">
<strong>1Billion ops/sec</strong> vs. 7M ops/sec
</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 130px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 13;" data-fragment-index="0">
<h3>Explination</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 200px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 14;" data-fragment-index="0">
<p style="color:rgb(255, 255, 255)">
<span>Depends on your browser:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span>Modern browsers heavily optimize the str+.</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="image" style="width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 15;" href="http://jsperf.com/wj-concat-vs-join" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1620867/tstupid.gif"></section>
<section>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 70px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<h2>Variables</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 144px; height: auto;">
<div class="sl-block-content" style="z-index: 12; text-align: left;">
<p>Global vs. local variable defenition</p>
</div>
</div>
<div class="sl-block" data-block-type="code" style="width: 496px; height: 448px; left: 439px; top: 78px;">
<div class="sl-block-content fragment" style="z-index: 14; border-width: 1px;" data-highlight-theme="xcode" data-fragment-index="0">
<pre class="javascript">
<code>//Global / outside reference
var i;
for (i=0; i<1000000; i++);
//Local function variable
function countMeLocal() {
var i;
for (i=0; i<1000000; i++);
}
countMeLocal(); </code></pre>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 130px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<h3>Experiment results</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 200px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 12;">
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Chrome, global vs local:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">363 ops/sec vs.
<strong>1,008 ops/sec</strong>
</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">FF, </span>
<span style="color:rgb(255, 255, 255)">global vs local</span>
<span style="font-size:1.0em">:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">164 ops/sec vs.
<strong>1,572 ops/sec</strong>
</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 130px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 13;" data-fragment-index="0">
<h3>Explination</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 200px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 14;" data-fragment-index="0">
<p style="color:rgb(255, 255, 255)">Scope chain lookup,</p>
<p style="color:rgb(255, 255, 255)">Global scope is a highly populated namespace,</p>
<p style="color:rgb(255, 255, 255)">
<span>Browser must distinguish between global variables and properties of objects that are in the current context. i.e </span>alert()
<span> and </span>window.alert()
</p>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 15;" href="http://jsperf.com/wj-local-function-variable2" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1620830/amazed.gif"></section>
<section>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 70px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h2>Functions</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 144px; height: auto;">
<div class="sl-block-content" style="z-index: 11; text-align: left;">
<p>Defining class methods</p>
</div>
</div>
<div class="sl-block" data-block-type="code" style="width: 496px; height: 448px; left: 439px; top: 78px;">
<div class="sl-block-content fragment" style="z-index: 12; border-width: 1px;" data-highlight-theme="xcode" data-fragment-index="0">
<pre class="javascript">
<code>//Define on instantiation
function MyClass() {
// constructor body
this.myFunc = function() {
// do something
};
}
//Define on the prototype
function MyClass() {
// constructor body
}
MyClass.prototype.myFunc = function() {
// do something
};
</code></pre>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 130px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h3>Experiment results</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 200px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<p style="color:rgb(255, 255, 255)">Instance Creation</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Chrome, instance vs. prototype:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">5M ops/sec vs.
<strong>70M ops/sec</strong>
</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">FF, instance vs. prototype:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">52M ops/sec vs.
<strong>518M ops/sec</strong>
</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 130px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 12;" data-fragment-index="0">
<h3>Explination</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 200px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 13;" data-fragment-index="0" dir="ui">
<p style="color:rgb(255, 255, 255)">In the prototype approach, only a single instance of myFunc is created, compared to the second approach where myFunc is created for each instance. </p>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 15;" href="ttp://jsperf.com/wj-define-class-method" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 130px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h3>Experiment results</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 49px; top: 200px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Function invocation</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Chrome, instance vs. prototype:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">
<strong>75M ops/sec</strong> vs. 68M ops/sec
</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">FF, instance vs. prototype:</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">
<strong>1,015 Billion</strong> ops/sec vs.
<strong>
<span style="color:rgb(255, 255, 255)">1,015 Billion</span> ops/sec
</strong>
</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 130px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 12;" data-fragment-index="0">
<h3>Explination</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 515px; top: 200px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 13;" data-fragment-index="0" dir="ui">
<p style="color:rgb(255, 255, 255)">Basically similar results.</p>
<p style="color:rgb(255, 255, 255)">Browsers heavily optimize the prototype chain lookup.</p>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 15;" href="http://jsperf.com/wj-invoke-function-on-instance-vs-on-prototype" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 92px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h2>Functions</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 166px; height: auto;">
<div class="sl-block-content" style="z-index: 11; text-align: left;">
<p>Access Instance variables declaration/initialization with value type </p>
</div>
</div>
<div class="sl-block" data-block-type="code" style="width: 496px; height: 448px; left: 439px; top: 100px;">
<div class="sl-block-content fragment" style="z-index: 12; border-width: 1px;" data-highlight-theme="xcode" data-fragment-index="0">
<pre class="javascript">
<code>//Define on instantiation
function MyClass() {
// constructor body
this.myNumber = 4;
this.myBoolean = true;
this.myString = 'what?!?!?';
this.myArray = [];
}
//Define on the prototype
function MyClass() {
// constructor body
this.myArray = [];
}
MyClass.prototype.myNumber = 4;
MyClass.prototype.myBoolean = true;
MyClass.prototype.myString = 'what?!?!?';</code></pre>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 25px; top: 41px;">
<a class="sl-block-content" style="z-index: 14;" href="http://jsperf.com/wj-access-variable-on-instance-vs-on-prototype" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1620832/same.gif">
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 522px; height: auto;">
<div class="sl-block-content">
<h1>Same Result</h1>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 70px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h2>Closures</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 430px; left: 25px; top: 144px; height: auto;">
<div class="sl-block-content" style="z-index: 11; text-align: left;">
<p>Invoke a function with closure vs. An inner function with no closure vs. a static reference to a function.</p>
</div>
</div>
<div class="sl-block" data-block-type="code" style="width: 455px; height: 538px; left: 480px; top: 78px;">
<div class="sl-block-content fragment" style="z-index: 13; border-width: 1px;" data-highlight-theme="xcode" data-fragment-index="0">
<pre class="javascript">
<code>//Closure (referencing msg)
function tellTheWorld() {
var msg = 'I am Iron Man';
setTimeout(function() {
alert(msg);
}, 100);
}
//Inner function - no closure
function tellTheWorld() {
setTimeout(function() {
var msg = 'I am Iron Man';
alert(msg);
}, 100);
}
//Reuse a static function
function theMessage() {
var msg = 'I am Iron Man';
alert(msg);
}
function tellTheWorld() {
setTimeout(theMessage, 100);
}</code></pre>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 42px; top: 90px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 10;">
<h3>Experiment results</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 42px; top: 160px; height: auto;">
<div class="sl-block-content" style="text-align: left; z-index: 11;">
<h3 style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Closure</span>
</h3>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Chrome 295K ops/sec </span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">FF 69K ops/sec</span>
</p>
<h3 style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Inner function</span>
</h3>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Chrome 297K ops/sec </span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">FF 70K ops/sec</span>
</p>
<h3 style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">Static function</span>
</h3>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:0.9em">
<strong>Chrome 328K ops/sec</strong>
</span>
</p>
<p style="color:rgb(255, 255, 255)">
<strong>
<span style="font-size:0.9em">FF 73K ops/sec</span>
</strong>
</p>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 508px; top: 90px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 12;" data-fragment-index="0">
<h3>Explination</h3>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 410px; left: 508px; top: 160px; height: auto;">
<div class="sl-block-content fragment" style="text-align: left; z-index: 13;" dir="ui" data-fragment-index="1">
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Closure is slowest - adds another level to the scope (scope chain lookup is slower)</span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Inner function is slower - recreating the function </span>
</p>
<p style="color:rgb(255, 255, 255)">
<span style="font-size:1.0em">Static function is fastest - referencing the same function</span>
</p>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 15;" href="http://jsperf.com/wj-closure-vs-inner-func-vs-static-func" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 190px; height: auto;">
<div class="sl-block-content" style="z-index: 10;">
<h1>Beware of</h1>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 287px; height: auto;">
<div class="sl-block-content" style="z-index: 11;">
<h2>eval, setTimeout, try-catch, a with statement</h2>
</div>
</div>
<div class="sl-block" data-block-type="image" style="min-width: 30px; min-height: 30px; width: 59px; height: 59px; left: 51px; top: 41px;">
<a class="sl-block-content" style="z-index: 13;" href="http://jsperf.com/ws-closure-vs-inner-vs-static-no-lookup" target="_blank">
<img data-natural-width="256" data-natural-height="256" style="" data-src="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1627629/chart-line-icon.png"/>
</a>
</div>
</section>
<section data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/360518/images/1620866/rocko.gif">
<div class="sl-block" data-block-type="text" style="height: auto; min-width: 30px; min-height: 30px; width: 452px; left: 225px; top: 0px;">
<div class="sl-block-content" style="z-index: 11;">
<h1>Thank You</h1>
</div>
</div>
</section>
<section>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 118px; height: auto;">
<div class="sl-block-content">
<h2>JS Pref Links</h2>
</div>
</div>
<div class="sl-block" data-block-type="text" style="width: 800px; left: 80px; top: 218px; height: auto;">
<div class="sl-block-content">
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-concat-vs-join</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-define-class-method</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-invoke-function-on-instance-vs-on-prototype</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-access-variable-on-instance-vs-on-prototype</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-closure-vs-inner-func-vs-static-func</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/ws-closure-vs-inner-vs-static-no-lookup</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-local-function-variable</span>
</p>
<p style="text-align:left">
<span style="font-size:0.7em">http://jsperf.com/wj-local-function-variable2</span>
</p>
</div>
</div>
</section>
</div>
</div>
</div>
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