Question

使用预定义数组初始化对象数组时，我面临很多问题。我无法将该数组复制到我的新对象数组。如果有人知道，那就告诉我。

admins基本上是一个数组，其中包含诸如["hello","hii","sup",....]

之类的字符串项

var admins = ["hello","hii","sup"];
var obj = [];

for(var i=0; i<admins.length; i++)
{
    obj[i].name = admins[i];
}

console.log(obj);

“ TypeError：无法设置未定义的属性'名称'”

Answer 1

使用map：

 async function main() {
      const browser = await puppeteer.launch({ headless: false });
      const page = await browser.newPage();
      await page.setViewport({ width: 1366, height: 800 });
      await page.goto(endpoint, { waitUntil: "networkidle2", timeout: 0 });
      await page.waitFor(3000);

      await page.type("#username", login);
      await page.type("#password", pass);
      // click and wait for navigation

      await page.click("#login"),
        await page.waitForNavigation({ waitUntil: "networkidle2" });
      await page.waitFor(2000);

       const client = await page.target().createCDPSession();
  await client.send("Page.setDownloadBehavior", {
    behavior: "allow",
    downloadPath: path.resolve(__dirname, "reports/asd")
  });

      await page.waitForXPath('//*[@id="ctl00_ctl00_masterMain_cphMain_repViewable_ctl01_thisItemLink"]');

      const [setting] = await page.$x('//*[@id="ctl00_ctl00_masterMain_cphMain_repViewable_ctl01_thisItemLink"]');
      if (setting) setting.click();

      await page.waitFor(3000);

      let pages = await browser.pages();

      await page.waitFor(2000);

      await pages[2].waitForXPath('/html/body/table/tbody/tr[17]/td[6]/a');
      const [newVID] = await pages[2].$x('/html/body/table/tbody/tr[17]/td[6]/a');
      if (newVID) newVID.click();

     await pages[2].waitFor(3000)

     await pages[2].close()

     await pages[2].waitFor(5000)

     await pages[2].waitForXPath('//*[@id="freeze"]/table/tbody/tr[2]/td/table/tbody/tr[3]/td/a');
     const [neww] = await pages[2].$x('//*[@id="freeze"]/table/tbody/tr[2]/td/table/tbody/tr[3]/td/a');
     if (neww) neww.click();

    await pages[2].waitFor(4000)

    await pages[2].waitFor(4000)

    await pages[2].waitForXPath('/html/body/div/table/tbody/tr[3]/td/a');
    const [fin] = await pages[2].$x('/html/body/div/table/tbody/tr[3]/td/a');
    if (fin) fin.click();

    }

    main()

Answer 2

恕我直言：使用传播算子：

const admins = ["John", "Doe", "Duck"];
const obj = [...admins].map(
  (admin) => ({ name: admin })
);
console.log(obj);

Answer 3

尝试一下

 var obj = [];

for (var i = 0; i < admins.length; i++) {
  let temp = {};
  temp["name"] = admins[i];
  obj.push(temp);
}

console.log(obj);

Answer 4

您需要将obj [i]定义为空对象（obj [i] = {}）。

您正在尝试访问未定义的名称属性（代码中未定义obj [i]）。

var obj = [];

    for(var i=0; i<admins.length; i++)
    {
     obj[i] = {
      name: admins[i]
     }
   }

    console.log(obj);

如何使用预定义的数组初始化对象的空数组？

4 个答案: