踩坑：ajax请求 statue code =200 ，但是进了

ajax请求 statue code =200 ，但是进了error。
控制台会有报错

Failed to load http://shop.ruitukeji.cn:8504/index.php?m=Api&c=Goods&a=shipping&invoice_no=3346058740462&shipping_company=shentong&token=6001df7862e8dddcd9bc668304d2939e: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://10.10.10.50:8080' is therefore not allowed access.

服务器没有加上 Access-Control-Allow-Origin ，因为在本地服务器调试，跨域了。后来在线调试，ok。