javascript - 标记的 continue 语句； for循环

Question

continue connloop; 抛出 Syntax Error: Unsyntactic continue。

如果我将 continue connloop; 更改为 continue; ，它将运行(但当然它不会在外部循环上执行，而是在内部循环上执行)

为什么会这样，这在 nodejs/ecma6 中是否已弃用或非法？

请不要推荐我使用函数调用代替标签。

redisSubscriber.on("message", function(channel, event){

event = JSON.parse(event);
const eventPayload = JSON.stringify(event.payload);

 connloop:
  for(let conn in connections){
  conn = connections[conn];
  redisClient.SMEMBERS('connection/'+conn.id+'/subscriptions', (err, subscriptions)=>{

      let intersectedTags = [];
      if(event.address.tags.length > 0 && subscriptions.length > 0){         
        for(let tag in subscriptions){
          tag = subscriptions[tag];

          for(let _tag in event.address.tags){
            _tag = event.address.tags[_tag];
            if(tag == _tag)
              intersectedTags.push(tag);

          }
        }
      }

      let exclusive = false;
      for(let userId in event.address.include){
        userId = event.address.include[userId];
        if(userId == conn.userId){
          exclusive = true;
          break;
        }
      }

      if(intersectedTags.length > 0 || exclusive){
        if(event.address.exclude){
          for(let exclude in event.address.exclude){
            exclude = event.address.exclude[exclude];
            if(exclude == conn.userId){
              continue connloop;
            }
          }
        }
        const browserEvent = {tags: intersectedTags, notification: eventPayload, exclusive};
        conn.write(JSON.stringify(browserEvent));
      }
  })
} });

Answer 1

在闭包函数之外使用 continue 标签是不符合语法的，因为 continue 语句和标签 connloop 的作用域不同:

// continue statement in anonymous function
redisClient.SMEMBERS('connection/'+conn.id+'/subscriptions', (err, subscriptions)=>{

遵循代码在相同范围内应该没问题:

redisSubscriber.on("message", function(channel, event){

connloop:
    for(let conn in connections){
        // more codes ...
        for(let exclude in event.address.exclude){
            exclude = event.address.exclude[exclude];
            if(exclude == conn.userId){
               continue connloop;
            }
        }
    }
});