为什么做不到那种要确认文本框不为空才能运行的效果
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> 鼠标经过事件 </title>
<script type="text/javascript">
function message(){
var laozai= document.getElementById("ddd").value;
if(laozai==""){
confirm("请输入密码后，再单击确定!"); }
else{
alert("你已经沉宫");
}
</script>
</head>
<body>
<form>
密码:<input name="password" type="password" id="ddd" >
<input name="确定" type="button" value="确定" onmouseover="message()"/>
</form>
</body>
</html>
