Implementation of SCSS mobile page mask layer effect and solutions to common problems

<header class="header"></header>
<p class="wrap-page">
    <section class="page"></section>
    ...   
</p>
<footer class="footer"></footer>
<p class="overlay">
    <section class="modal">
        <p class="modal-hd"></p>
        <p class="modal-bd"></p>
        <p class="modal-ft"></p>
    </section>
</p>

.overlay{   
    position: fixed;   
    top: 0;   
    rightright: 0;   
    bottombottom: 0;   
    left: 0;   
    z-index: -1;   
    background-color: rgba(0,0,0,.8);   
    @include flex-center; // flex水平垂直居中   
}   
.overlay.active {   
  z-index: 980;   
}   

$modalBarHeight: 40px !default;   
$modalBdPadding: 15px;   

.modal{   
    background-color: #fff;   
    border-radius: 5px;   
    margin: 0 10px;   
    overflow: hidden;   
    opacity: 0;   
    @include transform(translate3d(0,0,0) scale(0.815));   
    @extend %all-transition;   
    @include transition-property(transform, opacity);   

    &.modal-in{   
        opacity: 1;   
        @include transform(translate3d(0,0,0) scale(1));   
    }   

    .modal-hd{   
        text-align: center;   
        line-height: $modalBarHeight;   
        background-color: $primary;   
        color: #fff;   
    }   
    .modal-bd{   
        padding: $modalBdPadding;   
    }   
    .modal-ft{   
        border-top: 1px solid $gray;   
        @extend %display-flex;   
        .btn-modal{   
            @include flex(1);   
            background-color: #fefefe;   
            text-align: center;   
            line-height: $modalBarHeight;   
            color: $primary;   
            &:first-child{   
                border-right: 1px solid $gray;   
            }   
            &:last-child{   
                border-right: none;   
            }   
            &:hover,&:active{   
                background-color: #d9d9d9;   
            }   
        }   
    }   
}

/**
 * 初始化弹窗
 */
var initDialog = (function() {   
    var _tmpl = baidu.template('dialog-tpl', {});   

    return {   
        tmpl : $(_tmpl),   

        /**
         * [create 创建弹窗]
         * @return {[type]} [description]
         */
        create: function() {   
            var me = this,   
                _tmpl = me.tmpl;   

            $('body')   

            // 禁用鼠标滚轮滚动
            .css('overflow', 'hidden')   

            .append(_tmpl)   

            // 禁止touchmove，阻止body滑动
            .on('touchmove', function(e) {   
                e.preventDefault();   
            })   

            // 关闭动作
            .on('tap', 'dialog-close', function() {   
                me.destroy();   
            })   
        },   

        /**
         * [destroy 销毁弹窗]
         * @return {[type]} [description]
         */
        destroy: function() {   
            this.tmpl.remove();   

            // 解除touchmove绑定、启用滚动
            $('body').off().css('overflow', 'auto');   
        }   
    }   
})();

$(“:focus”).blur();

<style type="text/css">   
    body {   
        text-align: center;   
    }   
    input[type=text] {   
        width: 80%;    
        height: .8rem;   
        margin-top: .3rem;   
    }   
    .toast {   
        position: fixed;    
        bottombottom: .3rem;    
        left: 50%;    
        margin-left: -1rem;    
        width: 2rem;    
        height: 1rem;    
        background-color: #f00;    
        border-radius: 10px;   
        color: #fff;   
    }   
</style>   
<input type="text">   
<p class="toast">Toast</p>