*

Selects all elements.

Caution: The all, or universal, selector is extremely slow, except when used by itself.

示例:

Finds every element (including head, body, etc) in the document.

<!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="jquery.min.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>
演示:

示例:

A common way to select all elements is to find within document.body so elements like head, script, etc are left out.

<!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="jquery.min.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>
演示: