无法访问对象的属性？

Question

我正在阅读 sheet 使用 SheetJS (xlsx) 扩展从 excel 文件中读取，如下所示：

var workbook = XLSX.readFile(req.file.path);
var sheet_name_list = workbook.SheetNames;
let sheet_json = XLSX.utils.sheet_to_json(workbook.Sheets[sheet_name_list[0]]);

当我运行 console.log(sheet_json) 我得到：

[
  {
    'Question*': 'Question 1',
    'Number of Choices*': 2,
    'Choice A*': 'Apple',
    'Choice B*': 'Pineapple',
    'Answer (A/B/C/D)*': 'A',
    'Correct Marking*': 1,
    'Negative marking*': 0
  },
  {
    'Question*': 'Question 2',
    'Number of Choices*': 3,
    'Choice A*': 'Car',
    'Choice B*': 'Bike',
    'Choice C': 'Truck',
    'Answer (A/B/C/D)*': 'C',
    'Correct Marking*': 1,
    'Negative marking*': 1
  }
]

现在我遍历 sheet_json 数组，我无法验证属性，结果是这样的：


// i is the index of iterator. o is the object iterated


   let sn = ["Question*", "Number of Choices*"]
   let props = Object.keys(sheet_json[i]);
   console.log(props); //===> false
   console.log(props.findIndex(o=>o==sn[1])) //===> false
   console.log(o.hasOwnProperty(sn[1])); //===> false
   console.log("Number of Choices*" in o); //===> false
   console.log(sn[1] in sheet_json[i]); //===> false
   console.log(props.includes(sn[1].trim().toString())); //===> false
   console.log(o["Number of Choices*"]); //===> undefined
   console.log(o[sn[1]]!==undefined);  //===> false

为什么所有内容都显示为未定义或错误？请帮忙。

node -v：v13.14.0

npm -v: 6.14.4

xlsx: 0.16

这里还有 excel 文件：DOWNLOAD

Answer 1

我尝试在此处复制它 https://jsfiddle.net/t4ocdw67/。

sheet_json=[{...},{...}];
for(i in sheet_json)
{
    let o = sheet_json[i];
    let sn = ["Question*", "Number of Choices*"]
    .... //more code here
}

似乎工作正常，迭代部分可能有问题

无法访问对象的属性？

Can't access properties of an object?

javascript

arrays

excel

xlsx

node.js