jquery中ajax跨域问题

错误js代码：

function showCart(){
//var redirectUrl = window.location.href.substring(0,window.location.href.indexOf("club"))+'club/member/getCartProduct.jsp'; 跨域问题代码

var redirectUrl = '/club/member/getCartProduct.jsp';   //修改后代码
  jQuery.ajax({
     type: 'POST',
     url: redirectUrl,
     success: function(msg){
     jQuery("#cart").html(msg);
     }
  });
  document.getElementById("cart").style.display = "";
}