VUE实现todolist

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title></title>
    <script src="https://unpkg.com/vue@3"></script>

    <!-- 引入样式 -->
    <link rel="stylesheet" href="https://unpkg.com/element-plus/dist/index.css" />
    <!-- 引入组件库 -->
    <script src="https://unpkg.com/element-plus/dist/index.full.js"></script>

</head>
  <body>
    <div id="root"></div>
  </body>
  <script>
    const useInputEffect = ()=>{
        const{ref}=Vue;
        const inputValue = ref("111");
        const handleInputChange = (newValue) => {
          inputValue.value = newValue;
        };
        return {
            inputValue,
            handleInputChange,
        }
    }

    const useListEffect=()=>{
        let itemId=0;
        const{reactive,toRefs}=Vue;
        // const list = reactive([{content:"vue3"},{content:"yingyu"},{content:"shujujiegou"}]);
        let listObj = reactive({list:[]});
        let {list} = toRefs(listObj);
        let multiSelection = reactive([]);
        const addItemToList = (item)=>{
            listObj.list.push({ id:++itemId,content: item.value }); 
            item.value="";
        }
        const handlSelectionChange = (val)=>{
          multiSelection=val;
        }
        const handleDelete = ()=>{
          let list = listObj.list;
          if(multiSelection.length===0){
              alert("未选择");
              return;
          }
          multiSelection.forEach((selectedItem) => {
            list = list.filter((listItem)=>listItem.id!=selectedItem.id);
          });
          listObj.list = list;
        }
        return {
          list,
          addItemToList,
          handlSelectionChange,
          handleDelete,
          handlSelectionChange,
        };
    }

    const app = Vue.createApp({
      setup() {
        const{inputValue,handleInputChange}=useInputEffect();
        const{list,
          addItemToList,
          handlSelectionChange,
          handleDelete,
        }=useListEffect();
        const handleSubmit=()=>{
            addItemToList(inputValue)
        }
        return {
          inputValue,
          handleInputChange,
          handleSubmit,
          list,
          addItemToList,
          handlSelectionChange,
          handleDelete,
        };
      },
      template: `
        <div>
          <div>
              <el-input style="width:300px" :modelValue="inputValue" @input="handleInputChange"></el-input>
              <el-button @click="handleSubmit">提交</el-button>
          </div>
          <el-table
              border
              :data="list"
              @selection-change="handlSelectionChange"
              style="width: 200px;">
              <el-table-column
                type="selection"
                width="55">
              </el-table-column>
              <el-table-column
                prop="content"
                label="待办事项"
                width="199">
              </el-table-column>
            </el-table>
             <el-button @click="handleDelete">删除</el-button>
        </div>
      `,
    });
    
    app.use(ElementPlus);
    const vm = app.mount("#root");
  </script>
</html>