var wd = window.open();
$.ajax({
  type: "POST",
  dataType: "json",
  url: URL,
  data: {orderNo:orderNo},
  success: function(data) {
    if(data.status=='success'){
      wd.location.href = 'http://www.baidu.com';
    }else{ 
      alert('订单不能支付！'); 
    }
  },error: function(data) {
    alert("正在加载请稍后！");
  }
});

$.ajax({
  type: "POST",
  dataType: "json",
  url: URL,
  async: false,//同步请求
  data: {orderNo:orderNo},
  success: function(data) {
     if(data.status=='success'){
       window.open("www.baidu.com");
     }else{
       alert('订单不能支付！');
     }
  },
  error: function(data) {
    alert("正在加载请稍后！");
  }
});