javascript - 有没有更好的方法来检查标志，然后在javascript中的函数中设置可选参数？ (在js对象中编写函数)

Question

我在从事 Electron 项目时遇到了这种情况。下面是一个pouchDB put函数，我试图在其中上传附件
我当前的代码是这样的:

testCasesDB.put({
  _id: String(info.doc_count),
  collectionID: String(collectionID),
  name: String(tName),
  description: String(tDescription),
  performed: tPerform,
  added: tAdd,
  _attachments: {
    testCaseFile: {
      type: tAttachment.type,
      data: tAttachment,
    },
  },
  // ...
});

问题是我想检查是否设置了变量tAttachment。如果不是，我不想在pouchDB中添加附件，如果设置了附件，我希望如上所述。为此，我通常会编写两个重复的代码并添加_attachment选项。我想知道是否有更好的方法可以做到这一点。像这样吗？ (以下内容无效):

testCasesDB.put({
  _id: String(info.doc_count),
  collectionID: String(collectionID),
  name: String(tName),
  description: String(tDescription),
  performed: tPerform,
  added: tAdd,
  _attachments: {
    testCaseFile: {
      function() {
        if (tAttachment) {
          returnData = {
            type: tAttachment.type,
            data: tAttachment,
          };
        } else {
          returnData = null;
        }
        return returnData;
      },
    },
  },
});

Answer 1

在创建新实体之前，我可能会声明附件的 map :

const attachments = {};

if (tAttachment) {
  attachments.testCaseFile =  {
    type: tAttachment.type,
    data: tAttachment,
  }
}

testCasesDB.put({
  _id: String(info.doc_count),
  collectionID: String(collectionID),
  name: String(tName),
  description: String(tDescription),
  performed: tPerform,
  added: tAdd,
  _attachments: attachments,
  // ...
});