代码示例:(标识:jquery_dom_val_get)
<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    alert("Value: " + $("#test").val());
  });
});
</script>
</head>

<body>
<p>姓名:<input type="text" id="test" value="米老鼠"></p>
<button>显示值</button>
</body>

</html>
运行结果: