MUI 请求问题

ajax1:function(){
mui.ajax(getDetailUrl,{
data:{
userId:userId,
token:token,
oid:oid
},
contentType: "application/json",
dataType:'json',
type:'post',
timeout:10000,
success:function(data){
console.log(data);
},
error:function(xhr,type,errorThrown){
console.log(type);
}
})
},
我请求JAVA的接口 怎么回有跨域问题