<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload = function (){
function $(id) {return document.getElementById(id);}
$("btn").onclick = function (){
if($("txt").value=="bobby")
{
alert("恭喜");
}
else
{
alert("谢谢" );
}
}
}
</script>
</head>
<body>
<input type="text" id="txt" value="请输入。。。"> <button id="btn">查询</button>
</body>
</html>