在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
</head>
<body>

姓: <input type="text" id="myText" value="Mickey"><br>
<button onclick="disableTxt()">禁用文本域</button>
<button onclick="undisableTxt()">启用文本域</button>
<script>
function disableTxt() {
    document.getElementById("myText").disabled = true;
}
function undisableTxt() {
    document.getElementById("myText").disabled = false;
  }
</script>

</body>
</html>
源代码

动行结果
