Javascript变量问题多次命中

Getting Error Error[ERR_HTTP_HEADERS_SENT]：发送到客户端后无法设置头 我知道这是我试图用return关键字修复的循环中的问题，但没有成功

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如何解决此警告问题是否有其他方法解决此问题请协助

您应尝试返回数据

 let data;

     if(post.images.some(img => img._id == doc_id)) {
        post.images.forEach(function(e,i){
          if (post.images[i]._id == doc_id) { 
             data = ..... // if i defined here const data then i know its block scope will be access within this block only
            let isData = false;
            if (data.length === post.images[i].data.length) {
              data.push(myId);
              isData = true;
            }
          post.images[i].data = data

          }
          })
     } else {
       data = ..... // if i defined here const data then i know its block scope will be access within this block only        let isData = false;
        if (data.length === post.data.length) {
          data.push(myId);
          isData = true;
        }
        post.data = data;

     }

     res.out(data)

if(post.images.some(img => img._id == doc_id)) {
            post.images.forEach(function(e,i){
              if (post.images[i]._id == doc_id) { 
                 data = ..... // if i defined here const data then i know its block scope will be access within this block only
                  let isData = false;
                  if (data.length === post.images[i].data.length) {
                    data.push(myId);
                    isData = true;
                  }
                 post.images[i].data = data
                 return data;
               } 
            })
         }