ajax中result一直获取整个网页的代码，好像还获取不到action中的返回值，怎么破？

<script>
$(document).ready(function(addcollection){
$("#collection").click(function(){
//var userName=localstorage.getItem("userName");
var userName="张三";
var URL=window.location.href;
var title=$("#title").html();
$.ajax({
type:"POST",
URL:"__URL__/addcollection",
data:{'userName':userName,'URL':URL,'title':title},
dataType:"text",
success:function(return)
{
if(result==1)
{
alert("收藏成功");
}
else
{
alert(result);
}
},
});
});
});
</script>

public function addcollection()
{
$userName=$_POST["userName"];
$URL=$_POST["URL"];
$title=$_POST["title"];
$Collection=M("collection");
//insert into ren_collection(userName,URL,title) values("$userName","$URL","$title")
$result=$Collection->execute("insert into ren_collection(userName,URL,title) values('$userName','$URL','$title')");
if ($result==1) {
return 1;
}
else{
return 0;
}
}

大神们求解