常见跨域错误提示 from origin ‘null’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. 关注公众号“轻松学编程”学到更多。 使用jsonp处理get请求跨域问题 前端ajax: $.ajax({ url: '请求路由', type: 'GET', dataType