Loading

主体实现：

 /*
     loading UI
     */

    var Loading = function () {
        this._initId()
            ._init()
            ._createLoading()
            ._initMember();
    }

    Loading.prototype = {
        _init: function () {
            this._element = document.createElement('div');
            this._element.classList.add('ui-loading');
            this._element.id = this._loadingId;
            return this;
        },
        _initId: function () {
            this.__uuId = ++uuid;
            this._loadingId = "ui-loading-" + this.__uuId;
            return this;
        },
        _initMember: function () {
            return this;
        },
        _createLoading: function () {
            var backDrop = this._createBackDrop();
            var animation = this._createLoadingAnimation();
            $(this._element).append(backDrop);
            $(this._element).append(animation);
            return this;
        },
        _createBackDrop: function () {
            var fragement = [], h = -1;
            fragement[++h] = "<div class="ui-backdrop"></div>";
            return fragement.join('');
        },
        _createLoadingAnimation: function () {
            var fragement = [], h = -1;
            fragement[++h] = "<div class="ui-loading-dialog">";
            fragement[++h] = "<div class="ui-loading-circle">";
            fragement[++h] = "<span class="left">";
            fragement[++h] = "<span class="anim"></span>";
            fragement[++h] = "</span>";
            fragement[++h] = "<span class="right">";
            fragement[++h] = "<span class="anim"></span>";
            fragement[++h] = "</span>";
            fragement[++h] = "<span class="center"></span>";
            fragement[++h] = "</div>";
            fragement[++h] = "</div>";
            return fragement.join('');
        },
        loading: function (isShow) {
            var self = this;
            var clr = {
                true: function () {
                    $('body').append(self._element);
                },
                false: function () {
                    self._element.remove();
                },
                undefined: function () {
                    throw new Error('arguments can not empty.')
                }
            }
            clr[isShow]();
        }
    }

    if (!loader) {
        var loader = new Loading();
    }
    $$.loading = function (isShow) {
        loader.loading(isShow);
    }

样式：

section {
    border-bottom: 1px solid #FF9900;
    padding: 5px;
}

/*
    icon
*/
.ui-dorpdown-icon {
    height: auto;
    width: 20px;

    &:after {
        content: '25BC'
    }
}

/*
    dialog 
*/
button {
    border: 1px solid #9D9D9D;
    background-color: #fff;
    height: auto;
    padding: 5px 20px;
    border-radius: 5px;
    color: #9D9D9D;
    font-weight: inherit;
    font-style: inherit;
    font-family: inherit;
    cursor: pointer;

    &:hover {
        background: #9D9D9D;
        color: #fff;
    }
}

.ui-backdrop {
    POSITION: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(34, 34, 34, 0.5);
    z-index: 99;
}

.dialog {
    position: fixed;
    z-index: 100;
    top: 50%;
    left: 50%;
    right: 0;
    bottom: 0;
    border: 1px solid #ff9900;
    border-radius: 5px;
    text-align: center;
    background: #ffffff;

    .dialog-title {
        width: auto;
        height: 40px;
        line-height: 40px;
        background-color: #ff9900;
        font-weight: bold;
        color: #ffffff;
    }

    .dialog-content {
        padding: 10px;
    }

    .dialog-footer {
        position: absolute;
        bottom: 0px;
        background-color: #ff9900;
        width: 100%;
        height: auto;
        padding: 2px 0;
    }
}

/* 
    banner 
*/
.banner {
    position: relative;
    width: 100%;
    height: 400px;

    .banner-indicators {
        position: absolute;
        bottom: 20px;
        z-index: 10;
        width: 60%;
        padding-left: 0;
        list-style: none;
        text-align: center;
        width: 25%;
        left: 42%;

        .banner-indicators-item {
            list-style: none;
            float: left;
            width: 50px;
            padding: 5px 0;
            margin: 0 2px;
            opacity: 0.5;
            border: 0;
            background-color: #fff;
            height: auto;
            border-radius: 5px;
            margin-right: 50px;
            cursor: pointer;
        }

        .active {
            background-image: -webkit-linear-gradient(left, #9D9D9D, #000000 25%, #4F4F4F 50%, #000000 75%, #9D9D9D 100%);
            -webkit-text-fill-color: transparent;
            -webkit-animation: indicators-animation 2s infinite linear;
        }

        @-webkit-keyframes indicators-animation {
            0% {
                background: #9D9D9D;
                border: 3px solid #ffffff;
            }

            50% {
                background: #000000;
                border: 3px solid #9D9D9D;
            }

            100% {
                background: #9D9D9D;
                border: 3px solid #ffffff;
            }
        }
    }

    .banner-inner {
        width: 100%;
        height: 100%;
        overflow: hidden;

        .banner-content {
            width: 300%;
            height: 100%;
            transform: translate3d(-66.66666666%, 0, 0);
            transition: transform 0.6s ease-in-out;
            -webkit-transition: -webkit-transform 0.6s ease-in-out;

            .banner-item {
                display: inline-block;
                position: relative;
                width: 33.333333333%;
                height: 100%;
                background-repeat: no-repeat;
                background-size: cover;

                &:nth-child(1) {
                    background-image: url('./Image/banner0.jpg');
                }

                &:nth-child(2) {
                    background-image: url('./Image/banner1.jpg');
                }

                &:nth-child(3) {
                    background-image: url('./Image/banner2.jpg');
                }

                .banner-item-inner {
                    .title {
                        visibility: hidden;
                        transform: translate3d(-15%, 350%, 0);
                        transition: transform 0.3s ease-in-out;
                        -webkit-transition: -webkit-transform 0.3s ease-in-out;
                    }

                    .description {
                        visibility: hidden;
                        transform: translate3d(100%, 300%, 0);
                        transition: transform 0.3s ease-in-out;
                        -webkit-transition: -webkit-transform 0.3s ease-in-out;
                    }
                }

                .active {
                    .title {
                        visibility: visible;
                        transform: translate3d(30%, 350%, 0);
                    }

                    .description {
                        visibility: visible;
                        transform: translate3d(60%, 300%, 0);
                    }
                }

                .banner-item-inner {
                    p {
                        font-size: 40px;
                        font-weight: bold;
                        color: #fff;
                        font-style: italic;
                    }
                }
            }
        }
    }
}

.ui-combobox {
    position: relative;
    width: 200px;
    min-width: 50px;
    height: 30px;
    line-height: 30px;
    background-color: #fff;
    border: 1px solid #bbb;
    outline: 0;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;

    .ui-combobox-input {
        position: absolute;
        width: 100%;
        height: 100%;
        margin: 0 auto;
        outline: 0;
        overflow: hidden;
        resize: none;
        border: none;
        background: #fff;
        cursor: default;
        padding: 1px 30px 1px 5px;
        -moz-box-sizing: border-box;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
    }

    .ui-combobox-dropdown-container {
        position: absolute;
        height: 100%;
        right: 0;
        top: 0;
        border-left: 1px solid transparent;
        cursor: default;
    }

    .ui-combobox-placeholder {
        position: absolute;
        display: table;
        table-layout: fixed;
        height: 100%;
        top: 0;
        left: 5px;
        -moz-box-sizing: border-box;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
        color: #aaa;
    }
}

.ui-combobox-focused {
    border-color: #49d;
}

.ui-combobox-mouseover {
    border-color: #49d;
}

.ui-combobox-popup-shown {
    border-color: #49d;
}

.ui-combobox-popup {
    position: absolute;
    width: 198px;
    height: auto;
    background-color: #ffffff;
    border: 1px solid #bbb;
    box-sizing: content-box;

    .ui-combobox-listbox {
        height: auto;
        max-height: 300px;
        min-height: 22px;
        list-style: none;
        overflow: auto;
        background-color: #ffffff;
        box-sizing: border-box;

        .ui-combobox-listbox-container {
            display: table;
            width: 100%;

            .ui-combobox-selection-container {
                display: table-row;

                &:hover {
                    background-color: #F0F0F0;
                }

                .ui-combobox-selection {
                    display: table-cell;
                    border: 1px solid #ffffff;
                    outline: 0;
                    white-space: nowrap;
                    padding: 13px 0 13px 5px;
                    line-height: 1px;
                    cursor: default;
                }

                .ui-combobox-selection-selected {
                    background-color: #bbb;
                }
            }
        }
    }
}

/*
    loading
*/

.ui-loading {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 99999;
    display: block;
    text-align: center;

    &::before {
        content: '';
        height: 100%;
        width: 0;
        vertical-align: middle;
        display: inline-block;
    }

    .ui-loading-dialog {
        position: relative;
        vertical-align: middle;
        display: inline-block;

        .ui-loading-circle {
            position: relative;
            height: 60px;
            width: 60px;
            border-radius: 50%;
            background-color: #9D9D9D;

            &::before {
                height: 4px;
                width: 100%;
                left: 0;
                top: 28px;
                z-index: 1;
                position: absolute;
                content: "";
                background: #fff;
            }

            &::after {
                width: 4px;
                height: 100%;
                top: 0;
                right: 28px;
                position: absolute;
                content: "";
                background: #ffffff;
            }

            .left {
                position: absolute;
                height: 100%;
                width: 50%;
                overflow: hidden;
                left: 0;
            }

            .right {
                position: absolute;
                overflow: hidden;
                height: 100%;
                width: 50%;
                left: 50%;
            }

            .center {
                position: absolute;
                top: 6px;
                left: 6px;
                height: 48px;
                width: 48px;
                background: #fff;
                border-radius: 50%;
            }

            .anim {
                position: absolute;
                left: 100%;
                top: 0;
                height: 100%;
                width: 100%;
                border-radius: 999px;
                background-color: #ff9900;
                -webkit-animation: aui-circle-loading-left 2s infinite;
                animation: aui-circle-loading-left 2s infinite;
                -webkit-transform-origin: 0 50% 0;
                transform-origin: 0 50% 0;
                -webkit-animation-duration: 2s;
                -webkit-animation-timing-function: linear;
                animation-duration: 2s;
                animation-timing-function: linear;
            }


            .right .anim {
                -webkit-animation-name: aui-circle-loading-right;
                animation-name: aui-circle-loading-right;
            }

            .left .anim {
                border-bottom-left-radius: 0;
                border-top-left-radius: 0;
            }

            .right .anim {
                border-bottom-right-radius: 0;
                border-top-right-radius: 0;
                left: -100%;
                -webkit-transform-origin: 100% 50% 0;
                transform-origin: 100% 50% 0;
            }
        }
    }
}

@keyframes aui-circle-loading-left {
    0% {
        transform: rotate(0deg)
    }

    25% {
        transform: rotate(0deg)
    }

    50% {
        transform: rotate(180deg)
    }

    75% {
        transform: rotate(180deg)
    }

    100% {
        transform: rotate(360deg)
    }
}


@keyframes aui-circle-loading-right {
    0% {
        transform: rotate(0deg)
    }

    25% {
        transform: rotate(180deg)
    }

    50% {
        transform: rotate(180deg)
    }

    75% {
        transform: rotate(360deg)
    }

    100% {
        transform: rotate(360deg)
    }
}

效果：