Bootstrap 4 Tooltip

工具提示是用来在鼠标指针移动时向用户提供关于该元素的交互式文本提示。例如，在下面的图片中，GeeksForGeeks是一个按钮，当用户的鼠标移到它上面时，就会弹出 “一个计算机科学门户网站 “的附加信息。工具提示对于显示网页中不同元素的描述相当有用。

Bootstrap 4 Tooltip

创建工具提示： data-toggle=”tooltip “属性用于创建一个工具提示。title属性用来指定应该在工具提示中显示的文本。
示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Tooltip</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">
        <h1 style="color:green;" data-toggle="tooltip"
            title="Tooltip">
            GeeksforGeeks
        </h1>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="tooltip"]').tooltip();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Tooltip

定位工具提示： data-placement属性用于设置工具提示属性的位置。工具提示元素可以显示在元素的顶部、左侧、右侧或底部。
示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Tooltip</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">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Positioning Tooltip</h2>
        <button data-toggle="tooltip" data-placement="top"
            title="Top tooltip">Top
        </button>
        <button data-toggle="tooltip" data-placement="bottom"
            title="Bottom tooltip">Bottom
        </button>
        <button data-toggle="tooltip" data-placement="left"
            title="Left tooltip">Left
        </button>
        <button data-toggle="tooltip" data-placement="right"
            title="Right tooltip">Right
        </button>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="tooltip"]').tooltip();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Tooltip