javascript - 如何从json数组中选择一个元素并在html上显示

Question

我的 DynamoDb 本地数据库架构具有以下项目。

  {"Items": [{ "id": "A004","name": "ACC LR2","userId": ["1","2","3","4"], {"id": "0001","name": "ABG IT","userId": [ "8","9","10","11"]}}]}

我只想选择用户 ID 并使用 nodejs 将其列出到我的 html 页面中。我该怎么办？

///// MY entire code
router.get('/groups/group-info', function(req, res, next) {
///////////////////////////////////////
console.log("id "+req.query.id);
    var params = {
    TableName: 'userGroup',      
};


console.log("PARAMS: "+JSON.stringify(params));
dynamodb.scan(params, function(err, data) {
    if (err) {
      console.log(err);
    }
    else { 
       // console.log("These are Groups: "+ console.log(JSON.stringify(data.Items)));
         console.log("User DETAILS: "+ console.log(JSON.stringify(data.Items) ));
         // for each
function getUserId(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result.push(item.userId);
    });
    return result;
}

function getUserIdAll(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result = result.concat(item.userId);
    });
    return result;
}

console.log( getUserId(data) );
console.log( getUserIdAll(data) );
         // for each end 

     res.render('group-info',{_userD : data.Items});
  }
}); 
/////////////////////////////////

/*  res.render('group-info', { title: '' });*/
});
//////Entire code end

这就是我的整个代码的运行方式，我做错了什么？

Answer 1

var data = {
    "Items": [
        { 
            "id": "A004"
            , "name": "ACC LR2"
            , "userId": ["1","2","3","4"]
        }, { 
            "id": "0001"
            , "name": "ABG IT"
            , "userId": ["8","9","10","11"]
        }
    ]
}

function getUserId(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result.push(item.userId);
    });
    return result;
}

function getUserIdAll(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result = result.concat(item.userId);
    });
    return result;
}

console.log( getUserId(data) );
console.log( getUserIdAll(data) );

更新1：

function getUserId(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result.push(item.userId);
    });
    return result;
}

function getUserIdAll(obj){
    result = []
    obj.Items.forEach( function(item, i){
        result = result.concat(item.userId);
    });
    return result;
}

///// MY entire code
router.get('/groups/group-info', function(req, res, next) {
    ///////////////////////////////////////
    console.log("id "+req.query.id);
        var params = {
        TableName: 'userGroup',      
    };


    console.log("PARAMS: "+JSON.stringify(params));

    dynamodb.scan(params, function(err, data) {
        if (err) {
            console.log(err);
        }
        else {
            console.log("User DETAILS: "+ console.log(JSON.stringify(data.Items) ));
            res.render('group-info',{_userD : getUserIdAll(data) });
        }
    }); 
/////////////////////////////////

/*  res.render('group-info', { title: '' });*/
});