前台用jq发起一个post请求，请求都正常执行，但是发现后台报错了，Request method 'GET' not supported，好像程序无缘无故的提前发起了一个get请求，不知道为什么

$.ajax({
        type : "POST",
        url : "http://"+window.location.host+"/mobile/order/buyerOrderItems.json",
        data:{"orderId":orderId,"typeCode":0},
//        data : "orderId=" + orderId+ "&typeCode=0",
        beforeSend: function () {
            spinner.spin(document.getElementById("spin"));                    
        },
        success : function(data) {
            $.each(data.result, function(i, content) {
                var li="
"+content.title+"
"
                    +"
"+content.buyQuantity+"
"
                    +"
"+(content.factory==""?"":content.factory)+"
"
                    +"
"+content.price.toFixed(2)+"
";
                $(".productList>li").last().before(li);
            });
            spinner.spin();
        },
        error:function(data){
            spinner.spin();
        }
    });