关于MUI的ajax

function publish()  
    {  
        var title = document.getElementById('postTitle').innerHTML;  
        var content = document.getElementById('textarea').innerHTML;  
        mui.ajax('http://campus.ciqufu.com/user/post', {  
            data: {  
                "title": 'title',  
                "content": 'content'  
            },  
            type: 'post',   
            timeout: 10000,   
            success: function(data) {  
                mui.toast(data);  
            },  
            error: function(xhr, type, errorThrown) {  
                mui.toast('发送超时');  
            }  
        });  
    }

返回的错误

Request header field X-Requested-With is not allowed by Access-Control-Allow-Headers. 

但是我服务器后台已经设置了
header("Access-Control-Allow-Origin:*");

请求前辈分析下