/*************一次性消息订阅*******************/

const str_1 = '需要订阅的消息模板的id'        
const str_2 = '需要订阅的消息模板的id'       

 wx.getSetting({
        withSubscriptions: true,
        success: (value)=>{     
          if(value.subscriptionsSetting.mainSwitch == true){         
            wx.requestSubscribeMessage({
              tmplIds: [str_1 ,str_2 ],
              success : (res)=> { 
                console.log(res)
              },
              fail: (value)=>{
                console.log(value)
              }
            })
          }      
        }
      })

/****************永久性消息订阅*******************/

const str_1 = '需要订阅的消息模板的id'        
const str_2 = '需要订阅的消息模板的id'    

 wx.getSetting({
    withSubscriptions: true,
    success: (value)=>{
      if( !value.subscriptionsSetting.itemSettings &&    
       !value.subscriptionsSetting.itemSettings ){   
        wx.requestSubscribeMessage({
          tmplIds: [str_1 ,str_2],
          success : (res)=> { 
          },
          fail: (value)=>{
          }
        })
      }else{       
       const status = value.subscriptionsSetting.itemSettings  
       if(!value.subscriptionsSetting.itemSettings[str_1] &&
           !value.subscriptionsSetting.itemSettings[str_2]){
        wx.requestSubscribeMessage({
          tmplIds: [str_1 ,str_2],
          success : (res)=> { 
          },
          fail: (value)=>{   
          }
        })
       }else{        
       }
        
      }           
    }
  })  

/********永久性消息订阅可能会遇到的情况************/

const str_1 = '需要订阅的消息模板的id'        
const str_2 = '需要订阅的消息模板的id'       
const str_3 = '需要订阅的消息模板的id'    

    wx.getSetting({
     withSubscriptions: true,
     success: (value)=>{
      if(!value.subscriptionsSetting.itemSettings){        
        wx.requestSubscribeMessage({
          tmplIds: [str_1 ,str_2 ,str_3],
          success (res) { 
          },
          fail: (value)=>{
          }
        })
      }else{
        const status = value.subscriptionsSetting.itemSettings   
        if(status[str_1] == 'accept'){
          console.log('同意消息订阅')
        }else if(status[str_1] == 'reject'){    
          console.log('您拒绝了消息订阅','是否需要重新获取消息')
        }else if(status[str_1] == 'ban'){
          console.log("您已被后台拉黑")
        }
      }           
    }
    })

其实代码大致相同 只是逻辑处理方面的差异