javascript - 使用对象数组中的数据创建字符串数组的函数？

Question

我是一个对象数组，我想从中获取信息(电子邮件)并将其存储到新数组中。

我已经尝试了几次，但无法完全使其发挥作用。

我最近的尝试是:

function getAllCustomerEmails(data) {
    let emailArray = [];
    for (let i = 0; i < data.length; i++) {
        return data[i].email;
    }
}

我还需要做什么/我在这里做错了什么？

我能够让所有电子邮件与控制台日志一起显示，但无法完全使其以字符串形式返回或将其保存到数组中。

Answer 1

您没有向数组推送任何内容，您必须在循环内将 email 值推送到数组，并在循环完成后返回该数组。

注意:我在这里使用对象的模拟数组，因为我不知道您的数组是什么样子。

const array = [{
    userName: "name1",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2a5f594f58474b43461b6a4d474b434604494547" rel="noreferrer noopener nofollow">[email protected]</a>"
},{
    userName: "name2",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d3a6a0b6a1beb2babfe193b4beb2babffdb0bcbe" rel="noreferrer noopener nofollow">[email protected]</a>"
},{
    userName: "name3",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="acd9dfc9dec1cdc5c09feccbc1cdc5c082cfc3c1" rel="noreferrer noopener nofollow">[email protected]</a>"
}];

function getAllCustomerEmails(data) {
  let emailArray = [];
  for (let i = 0; i < data.length; i++) {
     emailArray.push(data[i].email);
  }
  return emailArray;
}

console.log(getAllCustomerEmails(array));

使用.map()的另一个选项

const array = [{
    userName: "name1",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9eebedfbecf3fff7f2afdef9f3fff7f2b0fdf1f3" rel="noreferrer noopener nofollow">[email protected]</a>"
},{
    userName: "name2",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="43363026312e222a2f7103242e222a2f6d202c2e" rel="noreferrer noopener nofollow">[email protected]</a>"
},{
    userName: "name3",
    email: "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="26535543544b474f4a1566414b474f4a0845494b" rel="noreferrer noopener nofollow">[email protected]</a>"
}];

const result = array.map(x =>{
    return x.email;
});
console.log(result);