No Access-Control-Allow-Origin header is present on the requested resource

 

關於跨域問題解決方案：

1、後臺添加設置：response.setHeader("Access-Control-Allow-Origin", "*");

2、nginx代理配置項加上允許跨域：

 add_header Access-Control-Allow-Origin *;
 add_header Access-Control-Allow-Credentials 'true'; 
 add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
 add_header Access-Control-Allow-Headers *;