我想做到，鼠标放上去输入的时候显示为密码，就是点点那种，看不见输入的什么，但是鼠标移开密码框就显示我自己设置的默认值。代码如下：请大神指导啊
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RunJS 演示代码</title>
<script>
onload = function(){
pp.onmouseenter = function(){
this.type="text";
}
pp.onmouseleave = function(){
this.type="password";
}
}
</script>
</head>
<body>
<input type="password" value="密码" id="pp" />
</body>
</html>
placehoder就行了，改type ie8-要报错