1.input标签的类型
1.1 email 代表邮箱类型,email必须在表单中，单纯分离是没意义的
1.2 url 网址
1.3 range 进度条
1.4 date 日期
1.5 search 搜索
1.6 color 更换颜色
1.7 number 只能输入数字
2.input-email
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="email">
<input type="submit">
</form>
3.input-url
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="url">
<input type="submit">
</form>
4.input-range
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="range">
<input type="submit">
</form>
5.input-date
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="date">
<input type="submit">
</form>
5.input-search
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="search">
<input type="submit">
</form>
6.input-color
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="color">
<input type="submit">
</form>
7.input-number
<form>
<label for="username">用户名</label>
<input id="username" name="username" type="number">
<input type="submit">
</form>
