HTML下拉列表框
讲解：
1、value：
2、selected="selected"：
设置selected="selected"属性，则该选项就被默认选中。
下拉列表框进行多选：
下拉列表也可以进行多选操作，在
HTML提交按钮
语法：
<input <strong>type="submit"</strong> value="提交">
type：只有当type值设置为submit时，按钮才有提交作用
value：按钮上显示的文字
HTML重置按钮
语法：
type="reset" value="重置">
type：只有当type值设置为reset时，按钮才有重置作用
value：按钮上显示的文字
HTML Form表单中的lable标签
label标签不会向用户呈现任何特殊效果，它的作用是为鼠标用户改进了可用性。如果你在 label 标签内点击文本，就会触发此控件。就是说，当用户单击选中该label标签时，浏览器就会自动将焦点转到和标签相关的表单控件上（就自动选中和该label标签相关连的表单控件上）。
语法：
<label for="控件id名称">
注意：标签的 for 属性中的值应当与相关控件的 id 属性值一定要相同。
例子：
<body> <form> 你对什么运动感兴趣：<br/> <label for="Run">跑步</label> <input type="checkbox" name="run" id="run" /> <br /> <label for="mountaineering">登山</label> <input type="checkbox" name="mountaineering" id="mountaineering" /> <br /> <label for="basketball">篮球</label> <input type="checkbox" id="basketball" placeholder="basketball"/> </form></body>
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