Javascript 输入值 returns 未定义（待办事项列表程序）

Question

在过去的一天里，我一直在用头撞墙，我就是无法让它工作每次我尝试创建一个待办事项列表时，它 returns 未定义而且我似乎无法检测到代码出了什么问题我还在学习中所以请放轻松

function addToList() {
  var item = document.getElementById("candidate").Value;
  var text = document.createTextNode(item);
  var li = document.createElement("li");

  li.appendChild(text);
  document.getElementById("toDoList").appendChild(li);
}

<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" href="/css/style.css" />
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
</head>

<body>
  <section>
    <div class="container">
      <div class="userToDoList">
        <input id="candidate" class="userInput" type="text" placeholder="New List..." />
        <button onclick="addToList()">Add</button>
      </div>
      <div class="addedLists">
        <ul id="toDoList"></ul>
      </div>
    </div>
  </section>
</body>
<script src="JS/Script.js"></script>

</html>

Answer 1

这一定很令人沮丧。 value.

使用大写 V

.Value 是无效的属性。您正在寻找 .value

function addToList() {
  var item = document.getElementById("candidate").value;
  var text = document.createTextNode(item);
  var li = document.createElement("li");

  li.appendChild(text);
  document.getElementById("toDoList").appendChild(li);
}

<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" href="/css/style.css" />
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
</head>

<body>
  <section>
    <div class="container">
      <div class="userToDoList">
        <input id="candidate" class="userInput" type="text" placeholder="New List..." />
        <button onclick="addToList()">Add</button>
      </div>
      <div class="addedLists">
        <ul id="toDoList"></ul>
      </div>
    </div>
  </section>
</body>
<script src="JS/Script.js"></script>

</html>

Javascript 输入值 returns 未定义（待办事项列表程序）

Javascript Input value returns undefined (To do list program)

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