​x
 
<!DOCTYPE html>
<html>
<head>
<style> 
option:disabled {
  background-color: lighgray;
}
</style>
</head>
<body>
​
<h1>:disabled 实例</h1>
​
<select>
  <option value="volvo">Volvo</option>
  <option value="saab" disabled>Saab</option>
  <option value="opel">BYD</option>
  <option value="audi" disabled>Audi</option>
  <option value="bmw">BMW</option>
</select>
​
</body>
</html>
​