All Selector (“*”)
Description: Selects all elements.描述：选择所有元素。
Caution: The all, or universal, selector is extremely slow, except when used by itself.
警示：这个选择器是非常缓慢的，除了自身使用时。
Examples:
Example: Finds every element (including head, body, etc) in the document.
例子：
查找文档中的所有元素（包括 head, body, 等等）。
<!DOCTYPE html>
<html>
<head>
<style>
h3 { margin: 0; }
div,span,p {
width: 80px;
height: 40px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div>DIV</div>
<span>SPAN</span>
<p>P <button>Button</button></p>
<script>var elementCount = $("*").css("border","3px solid red").length;
$("body").prepend("<h3>" + elementCount + " elements found</h3>");</script>
</body>
</html>
Demo:
Example: A common way to select all elements is to find within document.body so elements like head, script, etc are left out.
例子：选择所有元素的一种常见方式是在document.body内查找，那么像head, script等等这些元素将被忽略。
<!DOCTYPE html>
<html>
<head>
<style>
h3 { margin: 0; }
div,span,p {
width: 80px;
height: 40px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
#test {
width: auto; height: auto; background-color: transparent;
}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div id="test">
<div>DIV</div>
<span>SPAN</span>
<p>P <button>Button</button></p>
</div>
<script>
var elementCount = $("#test").find("*").css("border","3px solid red").length;
$("body").prepend("<h3>" + elementCount + " elements found</h3>");</script>
</body>
</html>
Demo:
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