JavaScript 自动填充一个字段与其他字段相同

javascriptweb developmentobject oriented programming更新于 2025/12/1 5:00:17

要自动填充一个字段与其他字段相同，JavaScript 脚本如下 −

示例

<!DOCTYPE html>
<html>
<head>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
</style>
</head>
<body>
<h1>JavaScript Auto-filling one field same as other</h1>
<h2>Enter your primary address</h2>
Address<input class="address" type="text" /> Pin Code<input class="pincode" type="text" />
<h4>Secondary Address same as primary</h4>
<input class="check" type="checkbox" /> Same Address
<h2>Enter your secondary address</h2>
Address<input class="address" type="text" /> Pin Code<input class="pincode" type="text" />
<script type="text/javascript">
   let checkEle = document.querySelector(".check");
   let addressEle = document.querySelectorAll(".address");
   let pinCodeEle = document.querySelectorAll(".pincode");
   checkEle.addEventListener("change", (event) => {
      if (event.target.checked) {
         console.log(addressEle[0].value);
         addressEle[1].value = addressEle[0].value;
         pinCodeEle[1].value = pinCodeEle[0].value;
      }
   });
</script>
</body>
</html>