<form>表单
<form action ="(处理表单数据的服务器的文件URL)" method ="POST"或"GET"> .... </form>
<input>表单元素
*文本框 *
<input type ="text" name ="xx">
单选框
<input type ="radio" name ="xxx" value ="aa"> <input type ="radio" name ="xxx" value ="bb"> .....
(加checked属性表默认选项)
复选框
<input type ="checkbox" name ="xxx" value ="aaa"> <input type ="checkbox" name ="xxx" value ="bbb"> .....
(加checked属性表默认选项，在name属性值后加"[]"，表可多选)
文本区
<textarea name="xxx" rows ="10" cols ="50">
选择菜单
<select name ="xxx"> <option value ="aa">....</option> <option value ="bb">....</option> ... </select>
（加multiple属性表多选菜单）
数字输入
<input type ="number" min ="0" max ="10">
范围输入
<input type ="range" min ="10" max= "100" step ="5">
颜色输入
<input type ="color">
日期输入
<input type ="data">
email输入
<input type ="email" >
url输入
<input type ="url">
tel输入
<input type ="tel">
文件输入
<input type ="file" name ="doc">
