Javascript .createTextNode 输出给出错误

Question

我创建了一个网站，上面会显示您的年龄。我使用 document.createTextNode 来存储输出，但输出无法正常工作。这是输出代码

var h1 = document.createElement("p");
h1.setAttribute("id", "mainText")
var mainText = document.createTextNode("You are ", ageYears, " years, ", ageMonths, " 
months and ", ageDays, " days old.");
h1.appendChild(mainText);
document.getElementById("new-age").appendChild(h1);

当我运行我的代码时，它只输出第一部分，“你是”。有什么办法可以输出整条消息吗

Answer 1

因为 document.createTextNode 只接收一个参数作为数据，你应该像下面的代码那样改变你的 document.createTextNode 来用你的数据生成一个字符串:(在你的代码中，因为你正在使用 , 连接字符串，实际上您将多个字符串传递给 document.createTextNode 并且它只读取第一个参数并忽略其他参数）

var mainText = document.createTextNode("You are " + ageYears + " years, " + ageMonths + "months and " + ageDays + " days old.");

或：

var mainText = document.createTextNode(`You are ${ ageYears} years, ${ageMonths} months and ${ageDays} days old.`);

这里有一个例子：

const ageYears = 30;
const ageMonths = 10;
const ageDays = 22;

function appendText() {
  let p = document.createElement("p");
  let mainText = document.createTextNode(`You are ${ ageYears} years, ${ageMonths} months and ${ageDays} days old.`);

  p.appendChild(mainText);
  document.getElementById("new-age").appendChild(p);
}

document.getElementById('appendBtn').addEventListener('click', appendText)

<div id="new-age"></div>
<button id="appendBtn">append text</button>

Answer 2

在 JavaScript 中，您使用 + 而不是 . 来连接字符串。

工作示例

var h1 = document.createElement("p");
h1.setAttribute("id", "mainText");
let ageYears = 20;
let ageMonths = 12
let ageDays = 24;
var mainText = document.createTextNode("You are " + ageYears + " years, " + ageMonths  + " months and " + ageDays + " days old.");
h1.appendChild(mainText);
document.getElementById("new-age").appendChild(h1);

<div id="new-age"></div>

Javascript .createTextNode 输出给出错误

Javascrit .createTextNode output is giving errors

javascript

output

createtextnode