一款基于css3和jquery实现的动画显示弹出层按钮教程

<div class="papersheet">  
            <!-- Action Trigger -->  
            <div class="papersheet__trigger">  
                <!-- Icon -->  
                <svg class="papersheet__trigger-icon" viewbox="0 0 24 24"><g transform="scale(0.023 0.023)"><path d="M1014.662 822.66c-0.004-0.004-0.008-0.008-0.012-0.010l-310.644-310.65 310.644-310.65c0.004-0.004 0.008-0.006 0.012-0.010 3.344-3.346 5.762-7.254 7.312-11.416 4.246-11.376 1.824-24.682-7.324-33.83l-146.746-146.746c-9.148-9.146-22.45-11.566-33.828-7.32-4.16 1.55-8.070 3.968-11.418 7.31 0 0.004-0.004 0.006-0.008 0.010l-310.648 310.652-310.648-310.65c-0.004-0.004-0.006-0.006-0.010-0.010-3.346-3.342-7.254-5.76-11.414-7.31-11.38-4.248-24.682-1.826-33.83 7.32l-146.748 146.748c-9.148 9.148-11.568 22.452-7.322 33.828 1.552 4.16 3.97 8.072 7.312 11.416 0.004 0.002 0.006 0.006 0.010 0.010l310.65 310.648-310.65 310.652c-0.002 0.004-0.006 0.006-0.008 0.010-3.342 3.346-5.76 7.254-7.314 11.414-4.248 11.376-1.826 24.682 7.322 33.83l146.748 146.746c9.15 9.148 22.452 11.568 33.83 7.322 4.16-1.552 8.070-3.97 11.416-7.312 0.002-0.004 0.006-0.006 0.010-0.010l310.648-310.65 310.648 310.65c0.004 0.002 0.008 0.006 0.012 0.008 3.348 3.344 7.254 5.762 11.414 7.314 11.378 4.246 24.684 1.826 33.828-7.322l146.746-146.748c9.148-9.148 11.57-22.454 7.324-33.83-1.552-4.16-3.97-8.068-7.314-11.414z"></path></g></svg>  
            </div>  
            <!-- Face 1 -->  
            <div class="papersheet__face-item animated fadeInUp">  
                <img src="128.jpg" alt="" />  
            </div>  
            <!-- Face 2 -->  
            <div class="papersheet__face-item animated fadeInUp">  
                <img src="129.jpg" alt="" />  
            </div>  
            <!-- Face 2 -->  
            <div class="papersheet__face-item animated fadeInUp">  
                <img src="130.jpg" alt="" />  
            </div>  
        </div>  
        <script src='jquery.js'></script>  
        <script>  
            _papersheet = $('.papersheet');   
            _trigger = $('.papersheet__trigger');   
            _trigger.click(function () {   
                if (_papersheet.hasClass('opened')) {   
                    $(this).parent('.papersheet').stop().removeClass('opened');   
                } else {   
                    $(this).parent('.papersheet').stop().addClass('opened');   
                }   
            });   
            //@ sourceURL=pen.js   
        </script>

@import url("http://daneden.github.io/animate.css/animate.min.css");   
            :root   
            {   
                width: 100%;   
                height: 100%;   
            }   
            body   
            {   
                width: 100%;   
                height: 100%;   
                display: -webkit-flex;   
                display: -ms-flexbox;   
                display: flex;   
                -webkit-align-items: center;   
                -ms-flex-align: center;   
                align-items: center;   
                -webkit-justify-content: center;   
                -ms-flex-pack: center;   
                justify-content: center;   
                overflow: hidden;   
                background-color: #263238;   
            }   
            .papersheet   
            {   
                position: relative;   
                overflow: hidden;   
                text-align: center;   
                -moz-box-sizing: border-box;   
                box-sizing: border-box;   
                -webkit-transition: all 200ms;   
                transition: all 200ms;   
                width: 100%;   
                height: 100%;   
                max-width: 50%;   
                min-width: 50rem;   
                max-height: 50%;   
                min-height: 20rem;   
                margin: 0 auto;   
                display: -webkit-flex;   
                display: -ms-flexbox;   
                display: flex;   
                -webkit-align-items: center;   
                -ms-flex-align: center;   
                align-items: center;   
                -webkit-justify-content: center;   
                -ms-flex-pack: center;   
                justify-content: center;   
            }   
            .papersheet.opened   
            {   
                -webkit-transition: all 900ms;   
                transition: all 900ms;   
                box-shadow: 0px 5px 20px rgba(0, 0, 0, 0.5);   
            }   
            .papersheet__trigger   
            {   
                z-index: 1;   
                display: inline-block;   
                padding: 2rem;   
                border-radius: 50%;   
                position: absolute;   
                background-color: transparent;   
                top: 50%;   
                left: 50%;   
                -webkit-transform: translate(-50%, -50%);   
                -ms-transform: translate(-50%, -50%);   
                transform: translate(-50%, -50%);   
                -webkit-transition: all 800ms cubic-bezier(0.19, 1, 0.22, 1);   
                transition: all 800ms cubic-bezier(0.19, 1, 0.22, 1);   
                cursor: pointer;   
            }   
            .opened .papersheet__trigger   
            {   
                background-color: #eceff1;   
                top: 10%;   
            }   
            .papersheet__trigger:hover   
            {   
                box-shadow: 0px 5px 20px rgba(0, 0, 0, 0.5);   
            }   
            .papersheet__trigger:active:before   
            {   
                background-color: #d5d5d5;   
            }   
            .papersheet__trigger:before   
            {   
                content: "";   
                background-color: #eceff1;   
                display: block;   
                position: absolute;   
                border-radius: 50%;   
                top: 50%;   
                left: 50%;   
                bottombottom: 50%;   
                rightright: 50%;   
                width: 6rem;   
                height: 6rem;   
                z-index: 0;   
                pointer-events: none;   
                -webkit-transform: translate(-50%, -50%);   
                -ms-transform: translate(-50%, -50%);   
                transform: translate(-50%, -50%);   
                -webkit-transition-delay: 2s;   
                transition-delay: 2s;   
                -webkit-transition: all 400ms cubic-bezier(0.165, 0.84, 0.44, 1);   
                transition: all 400ms cubic-bezier(0.165, 0.84, 0.44, 1);   
            }   
            .opened .papersheet__trigger:before   
            {   
                width: 3000px;   
                height: 3000px;   
                -webkit-transition: all 2.5s cubic-bezier(0.165, 0.84, 0.44, 1);   
                transition: all 2.5s cubic-bezier(0.165, 0.84, 0.44, 1);   
            }   
            .papersheet__trigger-icon  
            {   
                fill: #37474f;   
                vertical-align: bottombottom;   
                -webkit-transform: rotate(45deg);   
                -ms-transform: rotate(45deg);   
                transform: rotate(45deg);   
                -webkit-transition: all 800ms cubic-bezier(0.19, 1, 0.22, 1);   
                transition: all 800ms cubic-bezier(0.19, 1, 0.22, 1);   
                -webkit-transition-delay: 50ms;   
                transition-delay: 50ms;   
                width: 1.8rem;   
                height: 1.8rem;   
            }   
            .opened .papersheet__trigger-icon  
            {   
                -webkit-transform: rotate(-360deg);   
                -ms-transform: rotate(-360deg);   
                transform: rotate(-360deg);   
            }   
            .papersheet__face-item   
            {   
                border-radius: 50%;   
                margin: 0 1.5rem;   
                z-index: 1;   
                height: 6rem;   
                width: 6rem;   
                display: none;   
                overflow: hidden;   
            }   
            .papersheet__face-item:nth-child(2)   
            {   
                -webkit-animation-delay: 50ms;   
                animation-delay: 50ms;   
            }   
            .papersheet__face-item:nth-child(3)   
            {   
                -webkit-animation-delay: 150ms;   
                animation-delay: 150ms;   
            }   
            .papersheet__face-item:nth-child(4)   
            {   
                -webkit-animation-delay: 250ms;   
                animation-delay: 250ms;   
            }   
            .papersheet__face-item img   
            {   
                max-width: 100%;   
            }   
            .opened .papersheet__face-item   
            {   
                -webkit-transform: translateX(60%);   
                -ms-transform: translateX(60%);   
                transform: translateX(60%);   
                display: block;   
            }