​x
 
<!DOCTYPE html>
<html>
<body>
​
<button id="myBtn">我的按钮</button>
<br><br>
​
<button onclick="disableBtn()">禁用"我的按钮"</button>
<button onclick="enableBtn()">启用"我的按钮"</button>
​
<script>
function disableBtn() {
  document.getElementById("myBtn").disabled = true;
}
​
function enableBtn() {
  document.getElementById("myBtn").disabled = false;
}
</script>
​
</body>
</html>
​