菜鸟教程在线编辑器

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

<textarea id="myTextarea">
Runoob</textarea>
<br>

<button onclick="disableTxt()">禁用 textarea</button>
<button onclick="undisableTxt()">取消禁用</button>

<script>
function disableTxt() {
  document.getElementById("myTextarea").disabled = true;
}
function undisableTxt() {
  document.getElementById("myTextarea").disabled = false;
}
</script>

</body>
</html>
              