将获取AccessToken和jsTicket单独抽象为interface

officialaccount/context/context.go

@@ -1,31 +1,12 @@
 package context
 
 import (
-	"sync"
-
+	"github.com/silenceper/wechat/v2/credential"
 	"github.com/silenceper/wechat/v2/officialaccount/config"
 )
 
 // Context struct
 type Context struct {
 	*config.Config
-
-	//accessTokenLock 读写锁 同一个AppID一个
-	accessTokenLock *sync.RWMutex
-
-	//jsAPITicket 读写锁 同一个AppID一个
-	jsAPITicketLock *sync.RWMutex
-
-	//accessTokenFunc 自定义获取 access token 的方法
-	accessTokenFunc GetAccessTokenFunc
-}
-
-// SetJsAPITicketLock 设置jsAPITicket的lock
-func (ctx *Context) SetJsAPITicketLock(lock *sync.RWMutex) {
-	ctx.jsAPITicketLock = lock
-}
-
-// GetJsAPITicketLock 获取jsAPITicket 的lock
-func (ctx *Context) GetJsAPITicketLock() *sync.RWMutex {
-	return ctx.jsAPITicketLock
+	credential.AccessTokenHandle
 }