Question

在过去的一天里，我一直在用头撞墙，我就是无法让它发挥作用每次我尝试创建待办事项列表时，它都会返回未定义，我似乎无法检测到代码出了什么问题我还在学习过程中，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。您为 value 使用了大写的 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 输入值返回未定义（待办事项列表程序）

1 个答案: