• 小程序(uniapp)骨架屏应用


    1.基本理解

      骨架屏实现原理很简单,就是通过占位线框元素,渐进式加载数据。

      骨架屏是结合了懒加载功能,在页面没有加载完成之前,先呈现页面基本结构。

     

    效果图

    注意点:

    1, 引入组建后, template 标签内加入
    <skeleton selector="skeleton" bgcolor="#FFF" v-if="showSkeleton"></skeleton>

    • 其中 v-if="showSkeleton" 为显示骨架屏显示的参数。

    2, data对象中设置showSkeleton: true // 默认一开始进入页面加载骨架屏内容。

    • 骨架屏渲染形状有两种:矩形 & 圆形
    • 在想显示骨架屏的区域的父级标签的 class 加入 skeleton 表示该class下的内容进行骨架屏元素加载
    • 需要渲染矩形,则在该元素上的class加入skeleton-rect
    • 需要渲染圆形,则在该元素上的class加入skeleton-radius

    3, 渲染数据。

    • 渲染骨架屏的元素,需要先填充元素。使vue能够根据数据的长度进行渲染。
    • 列表类数据 字段值可为空。例如:
    dataList: [
        {
            title: '',
            author: '',
            pubTime: '',
            avatar: ''
        },
        {
            title: '',
            author: '',
            pubTime: '',
            avatar: ''
        }
    ]
    • 此时会渲染两条数据内容

    如果要应用小程序,把uni替换成wx即可

    skeleton.vue

    <template>
      <div>
        <div class="wrap"
             :style="{'width':systemInfo.width+'px','height':systemInfo.height+'px', 'background-color':bgcolor}">
          <div v-for="(item,index) in skeletonRectLists"
               :index='index'
               :key='index'
               class="chiaroscuro"
               :style="{'width':item.width+'px','height':item.height+'px','background-color':'rgba(233, 2, 233,1)','position':'absolute','left':item.left+'px','top':item.top+'px'}">
          </div>
          <div v-for="(item,index) in skeletonCircleLists"
               :index='index'
               :key="'info2-'+index"
               class="chiaroscuro"
               :style="{'width':item.width+'px','height':item.height+'px','background-color':'rgba(233, , 233,1)','border-radius':item.width+'px','position':'absolute','left':item.left+'px','top':item.top+'px'}">
          </div>
        </div>
      </div>
    </template>
    
    <script>
    /* eslint-disable */
    export default {
      props: {
        bgcolor: { type: String, value: '#FFF' },
        selector: { type: String, value: 'skeleton' },
      },
    
      data() {
        return {
          systemInfo: {},
          skeletonRectLists: [],
          skeletonCircleLists: [],
        };
      },
    
      components: {},
    
      methods: {
        rectHandle: function() {
          const that = this;
          //绘制不带样式的节点
          uni
            .createSelectorQuery()
            .selectAll(`.${this.selector}-rect`)
            .boundingClientRect()
            .exec(function(res) {
              that.skeletonRectLists = res[0];
            });
        },
    
        radiusHandle: function() {
          const that = this;
          uni
            .createSelectorQuery()
            .selectAll(`.${this.selector}-radius`)
            .boundingClientRect()
            .exec(function(res) {
                console.log(res[0].length);
              that.skeletonCircleLists = res[0];
            });
        },
      },
    
      mounted: function() {
        //默认的首屏宽高,防止内容闪现
        const systemInfo = uni.getSystemInfoSync();
        (this.systemInfo = {
           systemInfo.windowWidth,
          height: systemInfo.windowHeight,
        });
        const that = this;
        //绘制背景
        uni
          .createSelectorQuery()
          .selectAll(`.${this.selector}`)
          .boundingClientRect()
          .exec(function(res) {
            that.systemInfo.height = res[0][0].height + res[0][0].top || 0;
          });
    
        //绘制矩形
        this.rectHandle();
    
        //绘制圆形
        this.radiusHandle();
      },
    };
    /* eslint-enable */
    </script>
    
    <style scoped>
    .wrap {
      position: absolute;
      left: 0;
      top: 0;
      z-index: 9998;
      overflow: hidden;
    }
    .chiaroscuro {
      animation-duration: 1s;
      animation-fill-mode: forwards;
      animation-iteration-count: infinite;
      animation-name: placeHolderShimmer;
      animation-timing-function: linear;
      background: #f6f7f8;
      background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
      background-size: 800px 104px;
      height: 40px;
      position: relative;
    }
    @keyframes placeHolderShimmer{
      0% {
        background-position: -468px 0
      }
      100% {
        background-position: 468px 0
      }
    }
    </style>

    index.vue 页面

    <template>
        <view class="content ">
            <skeleton selector="skeleton" bgcolor="#FFF" v-if="showSkeleton"></skeleton>
            <view class="skeleton">
                <image class="logo skeleton-rect" src="/static/logo.png"></image>
                <view class="text-area skeleton-radius">
                    <text class="title">{{title}}</text>
                </view>
            </view>
            
        </view>
    </template>
    
    <script>
        import skeleton from '../index/skeleton'
        export default {
            data() {
                return {
                    showSkeleton:true,
                    title: 'Hello',
                    
                }
            },
            components:{
                'skeleton':skeleton
            },
            created() {
                this.reloadData();
            },
            methods: {
                 reloadData() {
                      setTimeout(() => {
                        this.showSkeleton = false
                      }, 2000)
                    },
            }
        }
    </script>

    参考地址:https://www.cnblogs.com/miku561/p/10726085.html

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  • 原文地址:https://www.cnblogs.com/liangtao999/p/11964552.html
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