tryjsref_option_selected 在线代码实例

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运行代码

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<!DOCTYPE html>
<html>
<head>
<script>
function displayResult()
{
document.getElementById("orange").selected=true;
}
</script>
</head>
<body>
<form>
Select your favorite fruit:
<select>
  <option id="apple">Apple</option>
  <option id="orange">Orange</option>
  <option id="pineapple" selected="selected">Pineapple</option>
  <option id="banana">Banana</option>
</select>
</form>
<button type="button" onclick="displayResult()">Select Orange</button>
</body>
</html>
 
 
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运行结果
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