'header新增全屏和消息功能'
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<template>
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    <div class="header">
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        <!-- 折叠按钮 -->
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        <div class="collapse-btn" @click="collapseChage">
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            <i class="el-icon-menu"></i>
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        </div>
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        <div class="logo">后台管理系统</div>
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        <div class="user-info">
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            <el-dropdown trigger="click" @command="handleCommand">
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                <span class="el-dropdown-link">
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                    <img class="user-logo" src="../../../static/img/img.jpg">
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                    {{username}}
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                </span>
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                <el-dropdown-menu slot="dropdown">
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                    <a href="http://blog.gdfengshuo.com/about/" target="_blank">
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                        <el-dropdown-item>关于作者</el-dropdown-item>
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                    </a>
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                    <a href="https://github.com/lin-xin/vue-manage-system" target="_blank">
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                        <el-dropdown-item>项目仓库</el-dropdown-item>
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                    </a>
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                    <el-dropdown-item divided  command="loginout">退出登录</el-dropdown-item>
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                </el-dropdown-menu>
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            </el-dropdown>
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        <div class="header-right">
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            <div class="header-user-con">
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                <!-- 全屏显示 -->
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                <div class="btn-fullscreen" @click="handleFullScreen">
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                    <el-tooltip effect="dark" :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
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                        <i class="el-icon-rank"></i>
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                    </el-tooltip>
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                </div>
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                <!-- 消息中心 -->
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                <div class="btn-bell">
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                    <el-tooltip effect="dark" :content="message?`有${message}条未读消息`:`消息中心`" placement="bottom">
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                        <router-link to="/tabs">
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                            <i class="el-icon-bell"></i>
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                        </router-link>
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                    </el-tooltip>
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                    <span class="btn-bell-badge" v-if="message"></span>
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                </div>
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                <!-- 用户头像 -->
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                <div class="user-avator"><img src="static/img/img.jpg"></div>
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                <!-- 用户名下拉菜单 -->
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                <el-dropdown class="user-name" trigger="click" @command="handleCommand">
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                    <span class="el-dropdown-link">
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                        {{username}} <i class="el-icon-caret-bottom"></i>
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                    </span>
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                    <el-dropdown-menu slot="dropdown">
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                        <a href="http://blog.gdfengshuo.com/about/" target="_blank">
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                            <el-dropdown-item>关于作者</el-dropdown-item>
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                        </a>
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                        <a href="https://github.com/lin-xin/vue-manage-system" target="_blank">
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                            <el-dropdown-item>项目仓库</el-dropdown-item>
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                        </a>
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                        <el-dropdown-item divided  command="loginout">退出登录</el-dropdown-item>
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                    </el-dropdown-menu>
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                </el-dropdown>
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            </div>
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        </div>
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    </div>
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</template>
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			@ -29,7 +49,9 @@
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        data() {
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            return {
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                collapse: false,
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                name: 'linxin'
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                fullscreen: false,
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                name: 'linxin',
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                message: 2
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            }
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        },
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        computed:{
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			@ -39,15 +61,44 @@
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            }
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        },
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        methods:{
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            // 用户名下拉菜单选择事件
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            handleCommand(command) {
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                if(command == 'loginout'){
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                    localStorage.removeItem('ms_username')
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                    this.$router.push('/login');
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                }
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            },
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            // 侧边栏折叠
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            collapseChage(){
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                this.collapse = !this.collapse;
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                bus.$emit('collapse', this.collapse);
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            },
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            // 全屏事件
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            handleFullScreen(){
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                let element = document.documentElement;
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                if (this.fullscreen) {
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                    if (document.exitFullscreen) {
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                        document.exitFullscreen();
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                    } else if (document.webkitCancelFullScreen) {
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                        document.webkitCancelFullScreen();
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                    } else if (document.mozCancelFullScreen) {
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                        document.mozCancelFullScreen();
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                    } else if (document.msExitFullscreen) {
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                        document.msExitFullscreen();
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                    }
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                } else {
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                    if (element.requestFullscreen) {
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                        element.requestFullscreen();
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                    } else if (element.webkitRequestFullScreen) {
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                        element.webkitRequestFullScreen();
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                    } else if (element.mozRequestFullScreen) {
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                        element.mozRequestFullScreen();
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                    } else if (element.msRequestFullscreen) {
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                        // IE11
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                        element.msRequestFullscreen();
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                    }
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                }
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                this.fullscreen = !this.fullscreen;
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            }
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        }
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    }
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			@ -59,13 +110,14 @@
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        width: 100%;
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        height: 70px;
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        font-size: 22px;
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        line-height: 70px;
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        color: #fff;
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    }
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    .collapse-btn{
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        float: left;
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        padding: 0 21px;
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        cursor: pointer;
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        line-height: 70px;
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    }
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    .collapse-btn:hover{
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        background: rgb(40,52,70);
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			@ -73,30 +125,59 @@
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    .header .logo{
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        float: left;
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        width:250px;
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        /* text-align: center; */
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        line-height: 70px;
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    }
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    .user-info {
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    .header-right{
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        float: right;
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        padding-right: 50px;
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        font-size: 16px;
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        color: #fff;
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    }
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    .user-info .el-dropdown-link{
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    .header-user-con{
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        display: flex;
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        height: 70px;
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        align-items: center;
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    }
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    .btn-fullscreen{
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        transform: rotate(45deg);
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        margin-right: 5px;
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        font-size: 24px;
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    }
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    .btn-bell, .btn-fullscreen{
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        position: relative;
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        display: inline-block;
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        padding-left: 50px;
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        color: #fff;
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        width: 30px;
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        height: 30px;
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        text-align: center;
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        border-radius: 15px;
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        cursor: pointer;
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        vertical-align: middle;
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    }
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    .user-info .user-logo{
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    .btn-bell-badge{
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        position: absolute;
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        left:0;
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        top:15px;
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        right: 0;
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        top: -2px;
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        width: 8px;
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        height: 8px;
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        border-radius: 4px;
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        background: #f56c6c;
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        color: #fff;
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    }
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    .btn-bell .el-icon-bell{
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        color: #fff;
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    }
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    .user-name{
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        margin-left: 10px;
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    }
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    .user-avator{
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        margin-left: 20px;
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    }
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    .user-avator img{
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        display: block;
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        width:40px;
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        height:40px;
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        border-radius: 50%;
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    }
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    .el-dropdown-link{
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        color: #fff;
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        cursor: pointer;
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    }
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    .el-dropdown-menu__item{
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        text-align: center;
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    }
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