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複製代碼 代碼如下:
<!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=utf-8" />
<title>無標題文檔</title>
<script type="text/javascript" src="jquery-1.7.1.min.js"></script>
<script type="text/javascript">
var sayHello=function(){
alert("Hello,World!");
}
$(function(){
sayHello();
$('option[value=0]').attr('selected','selected');
$('select').change(sayHello);
})
</script>
</head>
<body>
<select name="sel">
<option value="0">one</option>
<option value="1">two</option>
<option value="2">three</option>
</select>
</body>
</html>
以上代碼的功能實現了對一個函數的多處調用。值得注意的是，當函數作為其他函數的參數時和獨立調用時，寫法是有區別的，前者不用附加（），而後者必須加（）。
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