jquery selector: the difference between hidden and [type=hidden]-JS Tutorial-php.cn

Regarding the description of selector:hidden, the jquery description document says this: Match all invisible elements, or elements with type hidden. And [type=hidden] is to find all elements whose typeattribute is equal to hidden. There are similarities and differences between the two. :hidden matches all invisible elements, or elements of type hidden, all elements and sub-elements with style display equal to none and form elements with type="hidden" are in the search results, and [type= hidden] will only find elements whose type attribute is hidden.

So, input:hidden is to find input elements in invisible containers, including textbox, radio, checkbox, button, etc. and form elements of type="hidden". input[type=hidden] only searches for form elements with type="hidden". Such as the following example:

<!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>jquery Demo</title>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<script type="text/javascript">
function beforeHidden()
{
    $("#result").text("隐藏前：$(\"input:hidden\").length="+$("input:hidden").length+";$(\"input[type=hidden]\").length="+$("input[type=hidden]").length);
}
function afterHidden()
{
    $("#div1").hide();
    $("#result").append("<br/>隐藏后：$(\"input:hidden\").length="+$("input:hidden").length+";$(\"input[type=hidden]\").length="+$("input[type=hidden]").length);
}
</script>
</head>

<body>
<form id="form1" name="form1" method="post" action="">
<div id="div1">
<input type="text"  id="txt" />
<input type="radio" id="rdo" /><label for="rdo">单选框</label>
<input type="checkbox" id="chx"/><label for="chx">复选框</label>
<br />
<input type="button" id="btn1" value="原始" onclick="beforeHidden();"/>
</div>
<input type="hidden" id="hd"/>
<input type="button" id="btn2" value="隐藏后" onclick="afterHidden();"/>
<div id="result"></div></form>
</body>
</html>

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In the example, before div1 is hidden, $("input:hidden").length=1;$("input[type=hidden]").length=1, after hiding , after hiding: $("input:hidden").length=5;$("input[type=hidden]").length=1, obviously,

div1中的<input type="text"  id="txt" />
<input type="radio" id="rdo" />
<input type="checkbox" id="chx"/>
<input type="button" id="btn1" value="原始"/>

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is also included, and $ ("input[type=hidden]").length has never changed.

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