1. nginx配置:
# 允许跨域请求的域，* 代表所有
add_header 'Access-Control-Allow-Origin' *;
#允许请求的header
add_header 'Access-Control-Allow-Headers' *;
#允许带上cookie请求
add_header 'Access-Control-Allow-Credentials' 'true';
#允许请求的方法，比如 GET,POST,PUT,DELETE
add_header 'Access-Control-Allow-Methods' *;
2.服务端处理返回头部信息：
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Methods:*');
header("Access-Control-Max-Age: 600");//秒
header("Access-Control-Allow-Headers: *");
header("Access-Control-Allow-Credentials: true");
