代码示例:(标识:eg_js_navigator_javaenabled)
<!DOCTYPE html>
<html>
<body>

<h1>Navigator 对象</h1>

<p>如果启用了 Java,则 javaEnabled() 方法返回 true:</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML =
"javaEnabled 是:" + navigator.javaEnabled();
</script>

</body>
</html>
运行结果: