vue一个小方法

  <li
            v-bind:class="{completed: item.completed, editing: item === currentEditing}"
            v-for="(item, index) of filterTodos">
            <div class="view">
              <input
                class="toggle"
                type="checkbox"
                v-model="item.completed">
              <label
                @dblclick="currentEditing = item">{{ item.title }}</label>
              <button
                class="destroy"
                @click="removeTodo(index, $event)"></button>
            </div>
            <input
              class="edit"
              :value="item.title"
              @keyup.esc="currentEditing = null"
              @keyup.enter="saveEdit(item, index, $event)"
              @blur="saveEdit(item, index, $event)"
              v-editing-focus="item === currentEditing">
          </li>