jquery跨域获取json

<script type="text/javascript">
$(document).ready(function(){
//个人信息
$.getJSON("<%=Constants.get("DOMAIN_ID") %>/leftProfile?format=json&jsonpCallback=?",
function(data){
var img=data.Data[0].SmallPictureURL;
var name=data.Data[0].Nickname;
$("#profile").html("<a title='avatar' class='profile-img' href='#'>"+
"<img alt='avatar' src='"+img+"'/></a>"+
"<a class='profile-name' href='#'>"+name+"</a>");

});

//好友列表
$.getJSON("<%=Constants.get("DOMAIN_ID") %>/leftFriends?format=json&jsonpCallback=?",
{
'cursor' :'1',
'limit' :'9'
},
function(data){
var str = "<strong class=\"title\">朋友<\/strong>";
str+="<p class=\"links\"><span class=\"count\" id=\"friendsCount\"><\/span><a class=\"more\" href=\"<%=Constants.get("DOMAIN_ID") %>/myfriendlist.do\">查看全部<\/a><\/p>";
str+="<ul class=\"friend-list\">";

for (var i=0; i<data.Data.length; i++) {
str+="<li><a title=\"avatar\" href=\"<%=Constants.get("DOMAIN_ID") %>/id.do?id="+data.Data[i].FriendId+"\"><img alt=\"avatar\" src=\""+data.Data[i].FriendPictureSmall+"\"/><\/a><a class=\"name\" href=\"<%=Constants.get("") %>/id.do?id="+data.Data[i].FriendId+"\">"+data.Data[i].FriendName+"<\/a><\/li>";
}
str+="<ul class=\"friend-list\">";
$("#friendlist").html(str);

//好友总数
$.getJSON("<%=Constants.get("DOMAIN_ID") %>/leftFriendsNum?format=json&jsonpCallback=?",
function(data){
var num=data.Data;
$("#friendsCount").html(num+"位朋友");
}
);
}
);



});
</script>