摘要：無法使用括號表示法訪問對象鍵值，因為現(xiàn)有鍵作為未定義返回。我有一組用戶（通過解析 CSV 文件及其列構(gòu)建）：let users = [ { '?User ID': '5ef62675b78d747c79086175', 'Survey Completed Date': '11/12/19', 'Survey Type': 'Assessment' }, { '?User ID': '5ef62675b78d827c79086186', 'Survey Completed Date': '27/12/19', 'Survey Type': 'Assessment' }, ...];對于每個用戶，我需要訪問他們的用戶 ID 才能進(jìn)行貓鼬查詢。 console.log(users) // Logs the above object for (let i = 0; i < users.length; i++) { const row = users[i]; // Example with i = 0 console.log(row) // { // '?User ID': '5ef62675b78d747c79086175', // 'Survey Completed Date': '11/12/19'', // 'Survey Type': 'Assessment' // } console.log('User ID' in row) // false (??) <<<<<<<<< console.log(row['User ID']) // undefined (!?!) <<<<<<<<< console.log(row['Survey Completed Date']) // 11/12/19 (This works however) console.log(Object.keys(row)[0]) // User ID console.log(Object.keys(row)[0].trim() === 'User ID') // true console.log(row[Object.keys(row)[0]]) // 5ef62675b78d747c79086175 (want to // avoid using this workaround since // the properties will not always be // in the same order) let userId = row['User ID'] // (Still undefined) let user = await User.findById(userId);我有點卡住了。任何幫助或重定向?qū)⒉粍俑屑ぃ?
對象上的 JavaScript 方括號表示法在現(xiàn)有鍵上返回未定義
尚方寶劍之說
2023-09-28 17:22:22
