统计jQuery中各字符串出现次数的工具

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我是靠谱客的博主伶俐哑铃，最近开发中收集的这篇文章主要介绍统计jQuery中各字符串出现次数的工具，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/> 
<title>工具：统计jQuery中各字符串出现次数</title> 
<script src="http://demo.uoften.com/jslib/jquery/jquery.js" type="text/javascript"></script> 
</head> 
<body> 
<p>源文件(将jQuery源码复制到下面的文本域)：</p> 
<p><textarea id="myjquery" style="width: 510px; height: 250px; padding: 2px;">..</textarea></p> 
<p><input id="mybtn2" style="position: relative; left: 349px;" type="button" value="统计所有字符串出现次数" /></p> 
<div id="myshow2" style="width: 500px; height: 250px; border: 1px dotted #8B8D72; overflow: auto; padding: 5px;"> </div> 
<p> </p> 
<p><label for="myinput">字符串：<input id="myinput" type="text" /> <input id="mybtn1" style="position: relative; left: 130px;" type="button" value="统计单个字符串出现次数" 
/> </label></p> 
<div id="myshow1" style="width: 500px; height: 100px; border: 1px dotted #8B8D72; overflow: auto; padding: 5px;"> </div> 
<p> </p> 
<p>点击“统计所有字符出现次数”按钮后发现，字符串“string”竟然出现了44次，多数是诸如以下的代码</p> 
<div class="cnblogs_Highlighter"> 
<pre class="brush:javascript;gutter:true;">typeof selector === "string" 
typeof data !== "string" 
type === "string" 
typeof context === "string" 
getByName = typeof name === "string" 
// ... 
</pre> 
</div> 
<p>　　</p> 
<p>如果使用一个变量替换，使用工具压缩时将会进一步减少文件的大小。</p> 
<p> </p> 
<p> </p> 
<script type="text/javascript">// <![CDATA[ 
setTimeout(function(){ 
function buildRe(keywords) { 
var rObj = {}; 

if (keywords.constructor !== Array) { 
return; 
} 

keywords.forEach(function(it) { 
rObj[it] = RegExp(''+it, 'g'); 
}); 

return rObj; 
} 
function count(rObj, source, callback, sortType) { 
var r, 
rarr, 
num, 
type, 
func, 
result = []; 

var subCount = function(arr) { 
var i, re, num, resu; 
i = num = 0; 

for (i; i<arr.length; i++) { 
re = arr[i]; 
while( (resu=re.exec(source)) != null ) { 
num++; 
} 
} 

return num; 
}; 

for (type in rObj) { 
rarr = rObj[type]; 

if (rarr.constructor !== Array) { 
rarr = [rarr]; 
} 

num = subCount(rarr); 
result.push({type: type, num: num}); 
} 

// sort 0:次数顺序 1:次数倒序 
if (typeof sortType !== 'undefined') { 
if (sortType===0) { 
func = function(a, b) { 
return a.num - b.num; 
}; 
} else if (sortType===1) { 
func = function(a, b) { 
return b.num - a.num; 
}; 
} 
result.sort(func); 
} 

callback(result); 

} 
function main(keywords, source, callback, sortType) { 
var rObj = keywords.constructor === Array ? buildRe(keywords) : keywords; 
count(rObj, source, callback, sortType); 
} 
var rObj = { 
string: [/'string'/g, /"string"/g], 
number: [/'number'/g, /"number"/g], 
'boolean': [/'boolean'/g, /"boolean"/g], 
object: [/'object'/g, /"object"/g], 
'undefined': [/'undefined'/g, /"undefined"/g], 
'function': [/'function'/g, /"function"/g], 
'array': [/'array'/g, /"array"/g], 
'ready': [/'ready'/g, /"ready"/g], 
input: [/'input'/g, /"input"/g], 
type: [/'type'/g, /"type"/g], 
text: [/'text'/g, /"text"/g], 
radio: [/'radio'/g, /"radio"/g], 
checkbox: [/'checkbox'/g, /"checkbox"/g], 
password: [/'password'/g, /"password"/g], 
submit: [/'submit'/g, /"submit"/g], 
button: [/'button'/g, /"button"/g], 
id: [/'id'/g, /"id"/g], 
div: [/'div'/g, /"div"/g], 
body: [/'body'/g, /"body"/g], 
html: [/'html'/g, /"html"/g], 
HTML: [/'HTML'/g, /"HTML"/g], 
parentNode: [/'parentNode'/g, /"parentNode"/g], 
nextSibling: [/'nextSibling'/g, /"nextSibling"/g], 
iframe: [/'iframe'/g, /"iframe"/g], 
before: [/'before'/g, /"before"/g], 
after: [/'after'/g, /"after"/g], 
script: [/'script'/g, /"script"/g], 
width: [/'width'/g, /"width"/g], 
height: [/'height'/g, /"height"/g], 
top: [/'top'/g, /"top"/g], 
left: [/'left'/g, /"left"/g], 
absolute: [/'absolute'/g, /"absolute"/g], 
relative: [/'relative'/g, /"relative"/g], 
'static': [/'static'/g, /"static"/g], 
fixed: [/'fixed'/g, /"fixed"/g], 
href: [/'href'/g, /"href"/g], 
border: [/'border'/g, /"border"/g], 
margin: [/'margin'/g, /"margin"/g], 
marginTop: [/'marginTop'/g, /"marginTop"/g], 
marginBottom: [/'marginBottom'/g, /"marginBottom"/g], 
marginLeft: [/'marginLeft'/g, /"marginLeft"/g], 
marginRight: [/'marginRight'/g, /"marginRight"/g], 
padding: [/'padding'/g, /"padding"/g], 
paddingTop: [/'paddingTop'/g, /"paddingTop"/g], 
paddingLeft: [/'paddingLeft'/g, /"paddingLeft"/g], 
paddingRight: [/'paddingRight'/g, /"paddingRight"/g], 
display: [/'display'/g, /"display"/g], 
olddisplay: [/'olddisplay'/g, /"olddisplay"/g], 
none: [/'none'/g, /"none"/g], 
hidden: [/'hidden'/g, /"hidden"/g], 
inline: [/'inline'/g, /"inline"/g], 
opacity: [/'opacity'/g, /"opacity"/g], 
show: [/'show'/g, /"show"/g], 
hide: [/'hide'/g, /"hide"/g], 
toggle: [/'toggle'/g, /"toggle"/g], 
json: [/'json'/g, /"json"/g], 
success: [/'success'/g, /"success"/g], 
fxshow: [/'fxshow'/g, /"fxshow"/g], 
fx: [/'fx'/g, /"fx"/g], 
'.run': [/'.run'/g, /".run"/g], 
'http:': [/'http:'/g, /"http:"/g], 
error: [/'error'/g, /"error"/g], 
abort: [/'abort'/g, /"abort"/g], 
GET: [/'GET'/g, /"GET"/g], 
POST: [/'POST'/g, /"POST"/g], 
get: [/'get'/g, /"get"/g], 
filter: [/'filter'/g, /"filter"/g], 
px: [/'px'/g, /"px"/g] 
}; 
function callback1(result) { 
var obj = result[0]; 
var myshowEL = $('#myshow1'); 
myshowEL = myshowEL.empty(); 
myshowEL.append('<div>' + obj.type + ': <span style="color: blue;">' + obj.num + '</span></div>'); 
} 
function callback2(result) { 
var myshowEL = $('#myshow2'); 
myshowEL = myshowEL.empty(); 
for (var i=0; i<result.length; i++) { 
var obj = result[i]; 
myshowEL.append('<div>"' + obj.type + '": <span style="color: blue;">' + obj.num + '</span></div>'); 
} 
} 
$('#mybtn1').click(function(){ 
var $txtarea = $('#myjquery'); 
var source = $txtarea.val(); 
var val = $('#myinput').val(); 
if (val == '' || val.length<2) { 
alert('至少两个字符'); 
return; 
} 
var keywords = [val]; 
main(keywords, source, callback1, 1) 
}); 
$('#mybtn2').click(function(){ 
var $txtarea = $('#myjquery'); 
var source = $txtarea.val(); 
main(rObj, source, callback2, 1); 
}); 

}, 1000); 
// ]]></script> 
</body> 
</html>