Update README

Author: DataEraserC

main.go

@@ -95,16 +95,13 @@ func main() {
 		}
 
 		var token Token
-		if err := db.Where("user_id = ?", user.ID).First(&token).Error; err != nil {
-			// If token does not exist, create a new token for the user
-			token = Token{
-				UserID: user.ID,
-				Token:  generateToken(user.ID), // Assume there is a function generateToken to generate a unique token
-			}
-			if err := db.Create(&token).Error; err != nil {
-				c.JSON(400, gin.H{"code": 1, "message": "无法生成token"})
-				return
-			}
+		token = Token{
+			UserID: user.ID,
+			Token:  generateToken(user.ID), // Assume there is a function generateToken to generate a unique token
+		}
+		if err := db.Create(&token).Error; err != nil {
+			c.JSON(400, gin.H{"code": 1, "message": "无法生成token"})
+			return
 		}
 
 		c.JSON(200, gin.H{"code": 0, "message": "登录成功", "token": token.Token})