Bootstrap 4按钮

Bootstrap提供了不同的类，可用于不同的标签，如<button>、<a>、<input> ，以及<label>应用自定义按钮样式。Bootstrap还提供了可以用来改变按钮的状态和大小的类。此外，它还提供了用于应用切换、复选框和单选按钮等效果的类。
Bootstrap包含许多类来设置按钮元素的样式。下面给出了按钮类的列表。

.btn
.btn-primary
.btn-secondary
.btn-success
.btn-info
.btn-warning
.btn-danger
.btn-dark
.btn-light
.btn-link

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Buttons</h2>
        <button type="button" class="btn btn-primary">
            Primary</button>
        <button type="button" class="btn btn-secondary">
            Secondary</button>
        <button type="button" class="btn btn-success">
            Success</button>
        <button type="button" class="btn btn-warning">
            Warning</button>
        <button type="button" class="btn btn-danger">
            Danger</button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

注意：<a>、<button>和<input> 元素是用来存放按钮类的。

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Button Elements</h2>
        <input class="btn btn-success" 
            type="button" value="Input Button">
        <input class="btn btn-success" 
            type="submit" value="Submit Button">
        <input class="btn btn-success" 
            type="reset" value="Reset Button">
        <button class="btn btn-success" type="button">
            Button</button>
        <a href="#" class="btn btn-success" role="button">
            Link Button</a>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

按钮轮廓： Bootstrap提供了一系列的类，当我们需要在项目中使用轮廓风格的按钮，即没有背景颜色的按钮时，就可以使用这些类。轮廓按钮类可以去除应用于按钮的任何背景颜色或背景图片样式。这些类列在下面。

.btn-outline-primary
.btn-outline-secondary
.btn-outline-success
.btn-outline-info
.btn-outline-warning
.btn-outline-danger
.btn-outline-dark
.btn-outline-light
.btn-outline-link

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Button Outline</h2>
        <button type="button" class="btn btn-outline-primary">
            Primary
        </button>
        <button type="button" class="btn btn-outline-secondary">
            Secondary
        </button>
        <button type="button" class="btn btn-outline-success">
            Success
        </button>
        <button type="button" class="btn btn-outline-danger">
            Danger
        </button>
        <button type="button" class="btn btn-outline-warning">
            Warning
        </button>
        <button type="button" class="btn btn-outline-info">
            Info
        </button>
        <button type="button" class="btn btn-outline-light">
            Light
        </button>
        <button type="button" class="btn btn-outline-dark">
            Dark
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

按钮的大小： Bootstrap提供了不同的类，可以改变按钮的大小。.btn-lg和.btn-sm类用于大按钮和小按钮。

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Button Sizes</h2>
        <button type="button" 
            class="btn btn-success btn-sm">
            Small Button
        </button>
        <button type="button" 
            class="btn btn-success">
            Default Button
        </button>
        <button type="button" 
            class="btn btn-success btn-lg">
            Large Button
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

活动状态的按钮： .active类用于使按钮和链接进入活动状态。

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Button Active State</h2>
        <button type="button" 
            class="btn btn-success">
            Default Button
        </button>
        <button type="button" 
            class="btn btn-success active">
            Active Button
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

禁用状态按钮：禁用属性与<button>元素一起使用，用于设置按钮的禁用状态。

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Button Disabled State</h2>
        <button type="button" 
            class="btn btn-primary" disabled>
            Disabled Button
        </button>
        <button type="button" 
            class="btn btn-success" disabled>
            Disabled Button
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

块级按钮： .btn-block类用于创建块级按钮，它占用父元素的所有宽度。

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Block Level Buttons</h2>
        <button type="button" 
            class="btn btn-block btn-primary">
            Block Level Button
        </button>
        <button type="button" 
            class="btn btn-block btn-success">
            Block Level Button
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮

Spinner Buttons: spinner-*类用于在按钮上添加spinner。

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Buttons</title>
    <meta charset="utf-8">
    <meta name="viewport" 
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container mt-3">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Spinner Buttons</h2>
        <button type="button" class="btn btn-primary">
            <span class="spinner-border spinner-border-sm"></span>
            Spinner Button
        </button>
        <button type="button" class="btn btn-success">
            <span class="spinner-grow spinner-grow-sm"></span>
            Spinner Button
        </button>
    </div>
</body>
</html>

输出:
Bootstrap 4按钮