文本类：
文本框 <input type = "text" />
密码框 <input type = "password" />
隐藏域 <input type = "hidden" />
文本域 <textarea></textarea>
按钮类：
普通按钮 <input type = "button" value = "text" />
提交按钮 <input type = "submit" value = "提交" />
重置按钮 <input type = "reset" value = "重置" />
图片按钮 <input type = "image" />
选择类：
<input type = "radio" value = "1" id = "ra1">
<label for = "ra1">男</label>
<input type = "checkbox" value = "" id = ""><label for = ""></label>
<select>
<option vale = "1"></option>
</select>
<input type = "file" />