HTML DOM Input Number placeholder 属性

htmlweb developmentfront end technology更新于 2025/6/4 16:44:17

HTML DOM Input Number placeholder 属性返回并修改数字输入字段占位符属性的值。

语法

以下是语法 −

返回占位符

object.placeholder

修改占位符

object.placeholder = “text”

示例

让我们看一个 HTML DOM 输入数字占位符属性的示例 −

<!DOCTYPE html>
<html>
<head>
<style>
   html{
      height:100%;
   }
   body{
      text-align:center;
      color:#fff;
      background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) center/cover no-repeat;
      height:100%;
   }
   p{
      font-weight:700;
      font-size:1.1rem;
   }
   input{
      display:block;
      width:35%;
      border:2px solid #fff;
      background-color:transparent;
      color:#fff;
      font-weight:bold;
      padding:8px;
      margin:1rem auto;
   }
   .btn{
      background:#0197F6;
      border:none;
      height:2rem;
      border-radius:2px;
      width:35%;
      margin:2rem auto;
      display:block;
      color:#fff;
      outline:none;
      cursor:pointer;
   }
</style>
</head>
<body>
<h1>placeholder property Demo</h1>
<p>Hi, Enter your age:</p>
<input type="number" class="numberInput" placeholder="Enter your age">
<button type="button" onclick="change()" class='btn'>Change Placeholder</button>
<script>
   function change() {
      var numberInput = document.querySelector(".numberInput");
      numberInput.placeholder = "Please enter your age";
   }
</script>
</body>
</html>