Copy Code code as follows:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Untitled Document </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>
<body>
<select name= "SEL" >
<option value= "0" >one</option>
<option value= "1" >two</option>
<option value= "2" >three</option>
</select>
</body>
The function of the above code implements multiple calls to a function. It is noteworthy that when the function as a parameter of other functions and independent invocation, the writing is different, the former do not have to attach (), the latter must be added ().
