1、表单：
<div class="row"><div class="col mt-5"><form action="#"><div class="form-group"><!-- 放表单组，放置一组匹配的表单 --><label for="usename">用户名</label><!-- 提升用户体验的 --><input type="text" id="usename" class="form-control" placeholder="请输入用户名"><small class="form-text text-muted">用户名需要用英文、符号组成</small></div><div class="form-group"><label for="password">密码</label><input type="password" class="form-control" id="password" placeholder="请输入密码"></div><div class="form-group"><label for="passwordAgain">确认密码</label><input type="password" class="form-control" id="passwordAgain" placeholder="请再次输入密码" disabled><!-- disabled：禁用表单再次是使用 --></div><div class="form-group"><label for="area">所在地</label><select name="" id="area" class="form-control"><!-- multiple:让下拉框变成多选 --><option value="">北京</option><option value="">上海</option><option value="">广州</option><option value="">深圳</option></select></div><div class="form-group"><label for="file">选择文件</label><input type="file" class="form-control-file" id="file"></div><div class="form-group"><label for="range">滑块</label><input type="range" class="form-control-range" id="range"></div></form></div></div>
2、复选框、单选框
<div class="form-group">
<label for="">兴趣爱好：</label>
<div class="form-check form-check-inline">
<!-- form-check选择框要放在这个类里面， .form-check-inline是为了让表单在一行中显示 -->
<input type="checkbox" id="eat" class="form-check-input">
<label for="eat" class="form-check-label">吃饭</label>
</div>
<div class="form-check form-check-inline">
<input type="checkbox" id="sleep" class="form-check-input">
<label for="sleep" class="form-check-label">睡觉</label>
</div>
<div class="form-check form-check-inline">
<input type="checkbox" id="play" class="form-check-input">
<label for="play" class="form-check-label">打豆豆</label>
</div>
</div>
单选框：
<div class="form-group">
<label for="">性别：</label>
<div class="form-check form-check-inline">
<input type="radio" id="male" class="form-check-input" name="sex">
<label for="male" class="form-check-label">男</label>
</div>
<div class="form-check form-check-inline">
<input type="radio" id="female" class="form-check-input" name="sex">
<label for="female" class="form-check-label">女</label>
</div>
</div>
提交：
<button type="submit" class="btn btn-primary">提交</button>
3、表单的尺寸
1、大尺寸（两种差不多，只是padding值可能不一样）
1、.form-control-lg
2、.col-form-label-lg
2、小尺寸
1、.form-control-sm
2、.col-form-label-sm
<div class="row mt-5">
<div class="col">
<div class="form-group">
<input type="text" class="form-control form-control-lg" placeholder="大尺寸的表单">
</div>
<div class="form-group">
<input type="text" class="form-control" placeholder="正常尺寸的表单">
</div>
<div class="form-group">
<input type="text" class="form-control form-control-sm" placeholder="小尺寸的表单">
</div>
<div class="form-group">
<select name="" id="" class="form-control col-form-label-lg">
<option value="" >大尺寸的下拉框</option>
</select>
</div>
<div class="form-group">
<select name="" id="" class="form-control">
<option value="">正常尺寸的下拉框</option>
</select>
</div>
<div class="form-group">
<select name="" id="" class="form-control col-form-label-sm">
<option value="">小尺寸的下拉框</option>
</select>
</div>
</div>
</div>
4、只读属性
<!-- 只读属性 -->
<!-- 要加readonly -->
<div class="row mt-5">
<div class="col">
<form action="#">
<div class="form-group">
<input type="text" class="form-control" placeholder="只读文本" readonly>
</div>
<div class="form-group">
<input type="text" class="form-control-plaintext" placeholder="没有边框的只读文本" readonly>
</div>
</form>
</div>
</div>
5、表格排列
<!-- 表单栅格排列 -->
<form action="#"> <!-- form标签一定要放在行与列的外面！！！ -->
<div class="row">
<div class="col">
<input type="text" class="form-control" placeholder="栅格排列">
</div>
<div class="col">
<input type="text" class="form-control" placeholder="栅格排列">
</div>
</div>
</form>
<!-- 表单表格式的排列 -->
<form action="#">
<div class="form-row"> <!-- 这个class与row的唯一区别就是间距变小了 -->
<div class="col">
<input type="text" class="form-control" placeholder="栅格排列">
</div>
<div class="col">
<input type="text" class="form-control" placeholder="栅格排列">
</div>
</div>
</form>
6、栅格系列例子
<form action="#">
<div class="form-row mt-5">
<div class="col-md-6 form-group">
<!-- 小于768就会改变 -->
<label for="email1">Email</label>
<input type="email" class="form-control" id="email1" placeholder="请输入邮箱账号">
</div>
<div class="col-md-6 form-group">
<label for="password">Password</label>
<input type="password2" class="form-control" id="password2" placeholder="请输入密码">
</div>
</div>
<div class="row">
<div class="form-group col">
<!-- col：占12列 -->
<label for="homeAddres">家庭地址</label>
<input type="text" class="form-control" id="homeAddres" placeholder="请输入家庭地址">
</div>
</div>
<div class="row">
<div class="form-group col">
<label for="companyAddres">公司地址</label>
<input type="text" class="form-control" id="companyAddres" placeholder="请输入公司地址">
</div>
</div>
<div class="form-row">
<div class="col-md-6 form-group">
<label for="city">城市</label>
<input type="text" class="form-control" id="city" placeholder="请输入您所在的城市">
</div>
<div class="col-md-4 form-group">
<label for="marriage">婚姻状况</label>
<select class="form-control" id="marriage">
<option value="">已婚</option>
<option value="">未婚</option>
</select>
</div>
<div class="col-md-2 form-group">
<label for="education">学历</label>
<select class="form-control" id="education">
<option value="">博士</option>
<option value="">硕士</option>
<option value="">本科</option>
<option value="">大专</option>
<option value="">高中</option>
</select>
</div>
</div>
<div class="form-group">
<div class="form-check">
<input type="checkbox" class="form-check-input" id="grid">
<label for="grid" class="form-check-lable">同意所读内容</label>
</div>
</div>
<button type="submit" class="btn btn-primary">提交</button>
</form>
7、水平排列表单
<form action="#">
<div class="form-group row mt-5">
<label for="email2" class="col-sm-2 col-form-label">Email</label> <!-- col-form-lable用来决定下后面的表单进行垂直对齐 -->
<div class="col-sm-10">
<input type="email" class="form-control" id="email2" placeholder="请输入email">
</div>
</div>
<div class="form-group row">
<label for="password3" class="col-sm-2 col-form-label">Password</label> <!-- col-form-lable用来决定下后面的表单进行垂直对齐 -->
<div class="col-sm-10">
<input type="password" class="form-control" id="password3" placeholder="请输入密码">
</div>
</div>
<div class="form-group row">
<label for="" class="col-sm-2">兴趣爱好：</label>
<div class="col-sm-10">
<div class="form-check">
<input type="checkbox" id="eat" class="form-check-input">
<label for="eat" class="form-check-label">吃饭</label>
</div>
<div class="form-check">
<input type="checkbox" id="sleep" class="form-check-input">
<label for="sleep" class="form-check-label">睡觉</label>
</div>
<div class="form-check">
<input type="checkbox" id="play" class="form-check-input">
<label for="play" class="form-check-label">打豆豆</label>
</div>
</div>
</div>
<div class="form-group row">
<label for="" class="col-sm-2">性别：</label>
<div class="col-sm-10">
<div class="form-check">
<input type="radio" id="male" class="form-check-input" name="sex">
<label for="male" class="form-check-label">男</label>
</div>
<div class="form-check">
<input type="radio" id="female" class="form-check-input" name="sex">
<label for="female" class="form-check-label">女</label>
</div>
</div>
</div>
</form>
8、内联表单
<div class="row mt-5">
<div class="col">
<form action="#" class="form-inline">
<!-- form-inline：横着排列->相当于弹性盒模型 -->
<div class="form-group mr-5">
<label for="">用户名：</label>
<input type="email" class="form-control" value="kaivon@qq.com">
</div>
<div class="form-group mr-5">
<label for="">密码：</label>
<input type="password" class="form-control">
</div>
<div class="form-group mr-5">
<input type="checkbox" class="form-control-input">
<label for="" class="form-control-label">记住我</label>
</div>
<div class="form-group mr-5">
<button type="submit" class="btn btn-primary">提交</button>
</div>
</form>
</div>
</div>
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