<html>
<body>
Search: <input type="search" id="mySearch">
<p>电子按钮设置搜索字段为只读。</p>
<p><strong>提示：</strong> 为了查看效果，尝试在点击按钮前后在搜索字段中输入内容。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("mySearch").readOnly = true;
}
</script>
</body>
</html>