实现深复制代码片段：

<li v-for="(items, i) in shopFileListData" @click="onCheckBox(items)" :key="items.shopFileId" :class="{'li-checked': liChecked(items)}">
   <div class="source-file" style="width: 200px;">
        .....            
  </div>
</li>
export default {
    data() {
      return {
        shopFileListData:[],
        fileList:[],
      }
    },
    computed:{
      allChecked:{
        get: function() {
          return this.checkedCount == this.shopFileListData.length;
        },
        set: function (value) {
          if(value){
            this.checked = this.shopFileListData.map((items) => {
              this.fileList.push(items);
              return items.shopFileId+'';
            })
            //this.fileList = this.shopFileListData;
            console.log(JSON.stringify(this.fileList))
          }else {
            this.checked = [];
            this.fileList = []
          }
        }
      },
      checkedCount: {
        get: function() {
          return this.checked.length;
        }
      },
    },
  }

this.shopFileListData为json数组，通过map()把里面的items,push到this.fileList中，这样进行了深复制。

注：
用ES6函数箭头，才使this.fileList的this指向全局vue对象；
items.shopFileId+''是为了把items.shopFileId转化成字符串类型；