27推送消息框

消息框需要js引入：

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
        integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous">
</script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"
        integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" 
        crossorigin="anonymous"></script>

1、消息框

<script>
    //初始化推送消息框，必需要写这一步
     $(function () {
        $('.toast').toast('show');
    }); 
</script>
<div class="bg-danger">
    <div class="toast" data-autohide="false"><!-- data-autohide="false"：不让自动隐藏 -->
        <div class="toast-header">
            <!-- class="toast-header"；data-dismiss="toast"；class="toast-body" -->
            <strong class="mr-auto">Bootstrap</strong>
            <small>11 mins ago</small>
            <button class="close ml-2 mb-1" data-dismiss="toast">
                <span>&times;</span>
            </button>
        </div>
        <div class="toast-body">
            Hello, world! This is a toast message.
        </div>
    </div>
    <!-- 消息框多的时候会自动有间距 -->
    <div class="toast" data-autohide="false">
        <div class="toast-header">
            <strong class="mr-auto">Bootstrap</strong>
            <small>11 mins ago</small>
            <button class="close ml-2 mb-1" data-dismiss="toast">
                <span>&times;</span>
            </button>
        </div>
        <div class="toast-body">
            Hello, world! This is a toast message.
        </div>
    </div>
</div>

2、位置

<!-- 
        1、消息框不用栅格系统，可出现在网页任意的地方
        2、justify-content-center：居中对齐
-->
     <div class="d-flex mt-5 bg-dark p-5 justify-content-center">
        <div class="toast" data-autohide="false">
            <div class="toast-header">
                <strong class="mr-auto">Bootstrap</strong>
                <small>11 mins ago</small>
                <button class="close ml-2 mb-1" data-dismiss="toast">
                    <span>&times;</span>
                </button>
            </div>
            <div class="toast-body">
                Hello, world! This is a toast message.
            </div>
        </div>
    </div>

3、data-选项

<!-- 
        data-autohide="true" data-animation="true" data-delay="5000"
        data-delay="5000"：用这个属性的时候，一定把自动关闭设为true
 -->
     <div class="toast mt-5" data-autohide="true" data-animation="true" data-delay="5000">
        <div class="toast-header">
            <strong class="mr-auto">data-选项</strong>
            <small>11 mins ago</small>
            <button class="close ml-2 mb-1" data-dismiss="toast">
                <span>&times;</span>
            </button>
        </div>
        <div class="toast-body">
            Hello, world! This is a toast message.
        </div>
    </div>

4、方法与事件

<!-- 方法与事件 -->
<div class="toast mt-5" data-autohide="false" id="myToast">
    <div class="toast-header">
        <strong class="mr-auto">方法与事件</strong>
        <small>11 mins ago</small>
        <button class="close ml-2 mb-1" data-dismiss="toast">
            <span>&times;</span>
        </button>
    </div>
    <div class="toast-body">
        Hello, world! This is a toast message.
    </div>
</div>
<script>
    //方法
    $(function () {
        $('#myToast').toast('show');    //显示消息框
        setTimeout(function(){
            $('#myToast').toast('hide');    //隐藏消息框
        },3000);
    });
    //事件
    $('#myToast').on('show.bs.toast', function () {
        console.log('消息框要显示了');
    });
    $('#myToast').on('shown.bs.toast', function () {
        console.log('消息框已经显示了');
    });
    $('#myToast').on('hide.bs.toast', function () {
        console.log('消息框要隐藏了');
    });
    $('#myToast').on('hidden.bs.toast', function () {
        console.log('消息框已经隐藏了');
    });
</script>