第一修改是选项式：

<!-- 模板结构 -->
<template>
  <div>
    <textarea  placeholder="请输入备注内容" v-model="newItem"></textarea>
    <button @click="addItem">添加</button>
    <hr>
    <div class="text">
      <div v-for="(item, index) in items" :key="index" :class="{ 'finish': item.finish }">
        <button @click="removeItem(index)">删除</button>
        <button @click="toggleFinish(index)">{{ item.finish ? '取消' : '完成' }}</button>
        <span class="content">{{ item.name }}</span>
      </div>
    </div>
  </div>
</template>
<!-- 脚本行为 -->
<script>
export default {
  data() {
    return {
      newItem: '',
      items: []
    };
  },
  mounted() {
    this.loadTodo();
  },
  methods: {
    addItem() {
      this.items.push({ name: this.newItem, finish: false });
      this.saveTodo();
      this.newItem = '';
    },
    removeItem(index) {
      this.items.splice(index, 1);
      this.saveTodo();
    },
    toggleFinish(index) {
      this.items[index].finish = !this.items[index].finish;
      this.saveTodo();
    },
    saveTodo() {
      localStorage.setItem('mylogs', JSON.stringify(this.items));
    },
    loadTodo() {
      const savedItems = JSON.parse(localStorage.getItem('mylogs'));
      if (savedItems) {
        this.items = savedItems;
      }
    }
  }
};
</script>
<!-- 组件样式 -->
<style>
.finish {
  text-decoration: line-through;
  text-shadow: 2px 2px 2px LightslateGray;
  box-shadow: 0 0 10px 5px rgba(255, 255, 255, 0.916);
}
</style>

第2次修改

<template>
  <div>
    <textarea      
      placeholder="请输入备注内容"
      v-model="newItem"
    ></textarea>
    <button @click="addItem">添加</button>
    <hr />
    <div class="text">
      <div
        v-for="(item, index) in items"
        :key="index"
        :class="{ finish: item.finish }"
      >
        <button @click="removeItem(index)">删除</button>
        <button @click="toggleFinish(index)">
          {{ item.finish ? "取消" : "完成" }}
        </button>
        <span class="content">
          {{ index + 1 }}.{{ item.name }}
          {{ item.finish ? "(已完成)" : "" }}</span
        >
      </div>
    </div>
  </div>
</template>

<script >
  import { ref, onMounted } from "vue";

  export default {
    setup() {
      const newItem = ref("");
      const items = ref([]);

      const addItem = () => {
        items.value.push({ name: newItem.value, finish: false });
        saveTodo();
        newItem.value = "";
      };

      const removeItem = (index) => {
        items.value.splice(index, 1);
        saveTodo();
      };

      const toggleFinish = (index) => {
        items.value[index].finish = !items.value[index].finish;
        saveTodo();
      };

      const saveTodo = () => {
        localStorage.setItem("mylogs", JSON.stringify(items.value));
      };

      const loadTodo = () => {
        const savedItems = JSON.parse(localStorage.getItem("mylogs"));
        if (savedItems) {
          items.value = savedItems;
        }
      };

      onMounted(() => {
        loadTodo();
      });

      return {
        newItem,
        items,
        addItem,
        removeItem,
        toggleFinish,
        saveTodo,
        loadTodo
      };
    }
  };
</script>

<style scoped>
  .finish {
    text-decoration: line-through;
    text-shadow: 2px 2px 2px LightslateGray;
    box-shadow: 0 0 10px 5px rgba(255, 255, 255, 0.916);
  }
</style>

 第3次修改

<template>
  <div class="view">
    <!-- 左侧按钮 -->
    <div class="view_left">
      <button class="btn_checkbox">
        操作<input type="checkbox" v-model="showInput" value="操作" />
      </button>
      <button class="del_checkbox">
        删除 <input type="checkbox" v-model="showInput2" value="删除" />
      </button>
    </div>
    <!-- 中间内容 -->
    <div class="view_content">
      <!--  -->
      <div class="textarea_div">
        <textarea
          class="text-input-box"
          placeholder="请输入备注内容"
          v-model="newItem"
          v-if="showInput"
        ></textarea>
        <button @click="addItem" v-if="showInput">添加</button>
      </div>
      <!--  -->
      <div class="div_list">
        <div class="text">
          <div v-for="(item, index) in items" :key="index" :class="{ finish: item.finish }">
            <button @click="removeItem(index)" v-if="showInput2">删除</button>
            <button @click="toggleFinish(index)">
              {{ item.finish ? '取消' : '完成' }}
            </button>
            <button v-if="showInput" @click="edit(index)">编辑</button>

            <span class="content">
              <button class="numb">{{ index + 1 }}</button> {{ item.name }}
              {{ item.finish ? '(已完成)' : '' }}</span
            >
            <span v-show="oindex == index ? true : false" class="textarea_div">
              <textarea v-model="newItem"></textarea>
              <button @click="csu">提交</button>
            </span>
          </div>
        </div>
      </div>
    </div>
    <!-- 右侧按钮 -->
    <div class="view_right"></div>
  </div>
</template>

<script setup>
// import '@/assets/styles/view.scss'
// import '@/assets/styles/jottings_memo.scss'
// import '../../assets/styles/input_checkbox.scss'
import { ref, onMounted } from 'vue'
const showInput = ref(false)
const showInput2 = ref(false)
const newItem = ref('')
const items = ref([])
const oindex = ref(-1)

const addItem = () => {
  items.value.push({ name: newItem.value, finish: false })
  saveTodo()
  newItem.value = ''
}
const removeItem = (index) => {
  items.value.splice(index, 1)
  saveTodo()
}
const edit = (index) => {
  if (newItem.value === '' || false) {
    newItem.value = items.value[index].name

    oindex.value = index
  } else {
    newItem.value = ''
    oindex.value = -1
  }
}
const csu = () => {
  if (oindex.value === -1) {
    return
  }
  items.value[oindex.value].name = newItem.value
  oindex.value = -1
  newItem.value = ''
  saveTodo()
}

const toggleFinish = (index) => {
  items.value[index].finish = !items.value[index].finish
  saveTodo()
}

const saveTodo = () => {
  try {
    localStorage.setItem('jottings', JSON.stringify(items.value))
  } catch (error) {
    console.error('Failed to save todo items to localStorage:', error)
    // 可以添加适当的错误处理逻辑，比如向用户显示错误信息
  }
}

const loadTodo = () => {
  try {
    const savedItems = JSON.parse(localStorage.getItem('jottings'))
    if (savedItems) {
      items.value = savedItems
    }
  } catch (error) {
    console.error('Failed to load todo items from localStorage:', error)
    // 可以添加适当的错误处理逻辑，比如向用户显示错误信息
  }
}

onMounted(() => {
  loadTodo()
})
</script>

<style scoped>
.btn_checkbox,
.del_checkbox {
  box-shadow:
    inset -2px -2px 3px rgba(255, 255, 255, 0.589),
    inset 2px 2px 3px rgba(0, 0, 0, 0.6);
  border-radius: 50px;
  font-size: 20px;
  margin: 0px 0 0 0px;
  width: 40px;
  transform: translate(20px, 0px);
  input[type='checkbox'] {
    top: 3px;
    left: -4px;
  }
}
.del_checkbox {
  color: #ff0000;
  background-color: #f56c6c;
  margin-left: 10px;
}
button {
  background-color: #67c23a;
  color: #e6a23c;
  border-radius: 3px;
  border: 2px solid#ccc;
}
.div_list {
  overflow-x: auto;
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  border-radius: 10px;

  width: 84vw;
  height: 90vh;
  padding: 20px;
  border: 2px solid #ccc;
  .content {
    word-wrap: break-word;
    user-select: text;
    color: #8ac5ff93;
    font-size: 20px;
    &:hover {
      color: hsla(160, 100%, 37%, 1);
      text-shadow: 1px 1px 1px #000000;
      box-shadow: 0 0 10px 5px rgba(255, 255, 255, 0.916);
      border-radius: 50px;
      background-color: rgb(191, 210, 255);
    }
  }
}
.textarea_div {
  display: flex;
  textarea {
    background-color: #144756;
    color: #fff;
    font-size: 20px;
    height: 21px;
  }
}
.view_content .textarea_div {
  position: absolute;
}
.text {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 20px;
}
.finish {
  text-decoration: line-through;
  box-shadow: 0 0 10px 5px rgba(255, 255, 255, 0.916);
  background-color: rgb(191, 210, 255);
  border-radius: 50px;
  text-shadow: 1px 1px 1px #030303;
  box-shadow:
    inset -2px -2px 3px rgba(255, 255, 255, 0.6),
    inset 2px 2px 3px rgba(0, 0, 0, 0.6);
}
.numb {
  border-radius: 50px;
  color: hsla(160, 100%, 37%, 1);
  text-shadow: 1px 1px 1px #000000;
}

</style>