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實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
<script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
function changeSize()
  {
  $(this).animate({fontSize:"+=3px"});
  }
function changeSpacing()
  {
  $(this).animate({letterSpacing:"+=2px"});
  }
$(document).ready(function(){
  $("body").delegate("p","click",changeSize);
  $("body").delegate("p","click",changeSpacing);
  $("button").click(function(){
    $("body").undelegate("p","click",changeSize);
  });
});
</script>
</head>
<body>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<p>Click any p element to increase size and letterspacing.</p>
<button>Remove the event handler changeSize() for all p elements</button>
</body>
</html>
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運行結(jié)果