javascript - JS 计算重复出现次数

Question

我需要查找 td.aws 中的字符串是否出现超过 3 次，如果是，则将该字符串放入新列表中。

我有一个这样的表:

<table width="100%" cellspacing="0" cellpadding="2" border="1" class="aws_data">
<tbody><tr bgcolor="#ECECEC"><th>URL (1,908)</th></tr>
<tr><td class="aws">/images/bullet3.png</td></tr>
<tr><td class="aws">/pdf-signing-tool/ErrorCode.properties</td></tr>
<tr><td class="aws">/pdf-signing-tool/Display.properties</td></tr>
<tr><td class="aws">/evcert.cfm</td></tr>
<tr><td class="aws">/evcert.cfm</td></tr>
<tr><td class="aws">/evcert.cfm</td></tr>
<tr><td class="aws">/evcert.cfm</td></tr>
<tr><td class="aws">/repository/03</td></tr>
<tr><td class="aws">/repository/0</td></tr>
etc

<div id="problems"></div>

到目前为止我有:

$('.aws').each(function(){
var temp = $(this).text();
var count = temp.match('/'+temp+'/g');  

if (count.length > 3)
{
    thisString = $(this).text();
    $('#problems').append(thisString)
}

});

谁能帮忙，目前我只是收到 JS 错误“count is null”

JS FIDDLE

Answer 1

Example

//store the counts for each "text" occurrence in a hash table
var countHash = {}; 

//iterate over your tds
$('.aws').each(function(){

    //pull of the text
    var temp = $(this).text();

    //has it already been added to the list? 
    //see: 'countHash[temp] = false;' below.
    if(countHash[temp] === false){return;}

    //increment the occurrence count
    //or set to 1 if this is the first occurrence.
    countHash[temp] = (countHash[temp] || 0) + 1; 

    //have more than three been found?
    if (countHash[temp] > 3)
    {
        //add to your list
        $('#problems').append(temp);

        //ignore future occurrences
        countHash[temp] = false; 
    }
});