````golang
//使用中间件
router.Use(Cors())
````
````golang
func Cors() gin.HandlerFunc {
return func(c *gin.Context) {
method := c.Request.Method
origin := c.Request.Header.Get("Origin")
var headerKeys []string
for k, _ := range c.Request.Header {
headerKeys = append(headerKeys, k)
}
headerStr := strings.Join(headerKeys, ", ")
if headerStr != "" {
headerStr = fmt.Sprintf("access-control-allow-origin, access-control-allow-headers, %s", headerStr)
} else {
headerStr = "access-control-allow-origin, access-control-allow-headers"
}
if origin != "" {
//下面的都是乱添加的-_-~
// c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Headers", headerStr)
c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
// c.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language,DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma")
c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
// c.Header("Access-Control-Max-Age", "172800")
c.Header("Access-Control-Allow-Credentials", "true")
c.Set("content-type", "application/json")
}
//放行所有OPTIONS方法
if method == "OPTIONS" {
c.JSON(http.StatusOK, "Options Request!")
}
c.Next()
}
}
````
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