<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<form>
按钮:
<button id="firstbtn">OK</button>
<button id="secondbtn">OK</button>
</form>
<p>点击下面的按钮禁用上面的第一个按钮。</p>
<button onclick="disableElement()">禁用按钮</button>
<script>
function disableElement(){
document.getElementById("firstbtn").disabled=true;
}
</script>
</body>
</html>
