<script type="text/javascript">
$(document).ready(function(){
$("#firstpage").click();
});
</script>
$("button").click(function(){
$("input").trigger("select");
});
$(selector).trigger(event,[param1,param2,...])
<pre name="code" class="javascript">$(selector).trigger(eventObj)
<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("input").select(function(){
$("input").after("文本被选中！");
});
$("button").click(function(){
$("input").trigger("select");
});
});
</script>
</head>
<body>
<input type="text" name="FirstName" value="Hello World" />
<br />
<button>激活 input 域的 select 事件</button>
</body>
</html>