uni-app实现弹窗遮罩

<template>
    <view>
        <view class="systemboxItem" @click="showSystemDialog(index)" v-for="(item,index) in system" :key="index">
            <view class="systemboxItemTop">
                <span class="systemboxItemTopLeft">{{item.title}}</span>
                <span class="systemboxItemTopRight">{{item.replaceTime}}</span>
            </view>
            <view class="systemboxItemBottom">
                <span class="systemInformation"></span>
                <span class="redLittle"></span>
            </view>
        </view>
        <messageDialog :content="dialogContent"></messageDialog>
    </view>
</template><script>
    import Utils from '@/common/js/center.js';
    import messageDialog from '@/common/compoents/message-window/message-window.vue'
    export default {
        data() {
            return {
                system: [{
                    title: 1111,
                    replaceTime: '2019-8-7',
                    content: '1↵2↵3.↵4↵5↵6↵7↵8↵9↵10↵11↵12↵13↵14↵15↵↵'
                }],
                dialogContent: ''
            }
        },
        methods: {
            // 查看系统设置
            showSystemDialog() {
                this.dialogContent = this.system[index].content
                Utils.$emit('is-show-message-mask');
            },
        }
    }
</script>
<style lang="less">
    .systemboxItem {
        padding: 8upx 30upx;
        height: 100upx;
        background-color: #fff;
        box-sizing: border-box;
        margin-bottom: 20upx;        .systemboxItemTop {
            font-size: 30upx;            .systemboxItemTopRight {
                float: right;
                color: #A0A0A0;
            }
        }        .systemboxItemBottom {
            margin-top: 10upx;
            font-size: 25upx;
            color: #A0A0A0;            .systemInformation {
                display: inline-block;
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
                width: 70%;
            }            .redLittle {
                border-radius: 50%;
                width: 20upx;
                height: 20upx;
                background-color: #EF415C;
                display: inline-block;
                float: right;
                margin-top: 7upx;
            }
        }
    }
</style>

父组件

<template>
    <view class="dialog" @click="dialogClose" v-if="isShowDialog">
        <!-- <view class="dialog-block"> -->
        <view class="dialog-content" @click.stop="" :class="isShowMaskContent ? 'show-dialog' : 'hide-dialog'">
            <scroll-view :scroll-y="true" class="dialog-list">
                <text>{{content}}</text>
            </scroll-view>
            <view class="dialog-close iconfont iconfabu-guanbi1" @click="dialogClose"></view>
        </view>
        <!-- </view> -->    </view>
</template><script>
    import Utils from '@/common/js/center.js';
    export default {
        props: ['content'],
        data() {
            return {
                isShowDialog: false, // 整个弹窗
                isShowMaskContent: false, // 白色填充区域
            }
        },
        methods: {
            dialogClose() {
                let that = this;
                that.isShowMaskContent = false;
                setTimeout(function() {
                    that.isShowDialog = false;
                    that.$forceUpdate();
                }, 100);
            },
        },
        mounted() {
            let that = this;
            // 显示遮罩
            Utils.$on('is-show-message-mask', () => {
                that.isShowMaskContent = true;
                that.isShowDialog = true;
            });
        }
    }
</script><style scoped>
    .dialog {
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        position: fixed;
        left: 0;
        top: 0;
        padding-top: 10vh;
    }    .dialog-block {}    .dialog-content {
        width: 500upx;
        height: 80vh;
        margin: 0 auto;
        background: #FFF;
        border-radius: 10upx;
        overflow: hidden;
        position: relative;
    }    .dialog-close {
        width: 40upx;
        height: 40upx;
        border-radius: 20upx;
        position: absolute;
        right: 10upx;
        top: 10upx;
        font-size: 26upx;
        line-height: 40upx;
        text-align: center;
    }    .dialog-list {
        padding: 40upx 20upx;
    }    scroll-view {
        width: 100%;
        height: 100%;
    }    .show-dialog {
        animation: 100ms showDialog linear forwards;
    }    .hide-dialog {
        animation: 100ms hideDialog linear forwards;
    }    @keyframes hideDialog {
        0% {
            opacity: 1;
        }        ,
        100% {
            opacity: 0;
        }
    }    @keyframes showDialog {
        0% {
            opacity: 0;
        }        ,
        100% {
            opacity: 1;
        }
    }
</style>

子组件（弹窗）