麻烦帮我看看代码到底是哪里出错了呢？
<script>
window.onload=function (){
var login_btn=Document.getElementById('login'),
login_box=Document.getElementById('login_box'),
close=Document.getElementById('close');
function addEvent (ele,type,handler){
if (ele.addEventListener){
ele.addEventListener(type,handler,false)
}else if (ele.attachEvent) {
ele.attachEvent('on'+type,handler)
}else{
ele['on'+type]=handler;
}
}
function showLogin () {
login_box.style.display='block';
}
function hideLogin () {
login_box.style.display='none' ;
}
addEvent(login_btn,'click',showLogin);
addEvent(close,'click',hideLogin);
}
</script>哪里错了呢，麻烦大神帮指出来
