EJS遍历resultData

Question

我正在尝试从其中具有嵌套数组的Mongo集合中获取JSON对象。我数据库中的plantResult对象看起来像这样：

{
    "_id" : ObjectId("5bc97b175c3e221086646b95"),
    "username" : "test-user",
    "tentname" : "Tent1",
    "startdate" : "2018-06-06",
    "notes" : "No notes",
    "vegnutrients" : "grow1,grow2",
    "vegnutrientsvalues" : [
        [
            {
                "_id" : ObjectId("5bc68c91296be70081afdeff"),
                "nutrientname" : "grow",
                "description" : "Test Grow",
                "week1" : 6,
                "week2" : 6,
                "week3" : 12,
                "week4" : 14,
                "week5" : 8,
                "week6" : 0,
                "week7" : 0,
                "week8" : 0,
                "week9" : 0,
                "week10" : 0
            }
        ],
        [ ]
    ],
    "growmedium" : "soil"
}

然后我使用EJS和Express在路由器文件中呈现页面，如下所示：

res.render('viewplant', { username: uname, tentname: tentname, resultData: plantResult } );

然后我尝试遍历结果并尝试通过以下方法获取week1数组中每个项目的vegnutrientsvalues值：

<script>
  var vegnutrients = "<%= resultData[0].vegnutrients %>";
  //delimit on comma and add individual nutrients to array
  var finalveg = vegnutrients.split(",");
  for (var i = 0; i < finalveg.length; i++) {
    //WHY CANT IT USE i TO ITERATE THROUGH vegnutrientvalues????
    var finalvnd = "<%= resultData[0].vegnutrientsvalues %>";
    console.log(finalvnd[i][0].week1);
  }
</script>

但是随后控制台读取undefined，调试器显示以下内容：

var finalvnd = "[object Object],";
console.log(finalvnd[i][0].week1);

但是当我直接像这样获取数据时：

var finalvnd = "<%= resultData[0].vegnutrientsvalues[0][0].week1 %>";
console.log(finalvnd);

它将正确的值记录到控制台，所以我知道数据在那里，我只是不知道如何正确访问它。我想使用for循环中的i作为索引来获取当前营养素的week1值。有人看到我要去哪里了吗？

Answer 1

假设您的resultData是一个数组。     resultData [0] .veg Nutritionsvalues 您的veg Nutritionsvalues是嵌套数组，那么在这种情况下，您需要首先循环resultData [0] .veg Nutritionsvalues值，然后遍历     finalveg [i] .length

 for (var i = 0; i < finalveg.length;  finalvnd = "<%= 
    resultData[0].vegnutrientsvalues %>";
    console.log(finalvnd[i][0].week1);
     <% for (var j = 0; j < finalveg[i].length; j++) {%>
  }