this.todos.push(this.title)

这是一个 JavaScript 代码片段，其中 `this` 指向当前对象， `todos` 是当前对象的一个数组属性， `push()` 方法是在数组尾部添加一个元素， `title` 是当前对象的一个属性，将这个属性的值添加到 `todos` 数组中。这段代码的作用是将 `title` 属性的值添加到 `todos` 数组中。

相关问题

TodoMVC-vue.js的js文件

以下是TodoMVC-vue.js的js文件：

/*global Vue, todoStorage */
(function (exports) {

	'use strict';

	// 定义过滤器
	var filters = {
		all: function (todos) {
			return todos;
		},
		active: function (todos) {
			return todos.filter(function (todo) {
				return !todo.completed;
			});
		},
		completed: function (todos) {
			return todos.filter(function (todo) {
				return todo.completed;
			});
		}
	};

	// TodoMVC 应用程序
	var app = new Vue({

		// 应用程序绑定的根元素
		el: '.todoapp',

		// 应用程序的数据
		data: {
			todos: todoStorage.fetch(),
			newTodo: '',
			editedTodo: null,
			visibility: 'all'
		},

		// 计算属性
		computed: {
			filteredTodos: function () {
				return filters[this.visibility](this.todos);
			},
			remaining: function () {
				return filters.active(this.todos).length;
			},
			allDone: {
				get: function () {
					return this.remaining === 0;
				},
				set: function (value) {
					this.todos.forEach(function (todo) {
						todo.completed = value;
					});
				}
			}
		},

		// 观察者
		watch: {
			todos: {
				deep: true,
				handler: todoStorage.save
			}
		},

		// 方法
		methods: {
			addTodo: function () {
				var value = this.newTodo && this.newTodo.trim();
				if (!value) {
					return;
				}
				this.todos.push({
					title: value,
					completed: false
				});
				this.newTodo = '';
			},
			removeTodo: function (todo) {
				this.todos.splice(this.todos.indexOf(todo), 1);
			},
			editTodo: function (todo) {
				this.beforeEditCache = todo.title;
				this.editedTodo = todo;
			},
			doneEdit: function (todo) {
				if (!this.editedTodo) {
					return;
				}
				this.editedTodo = null;
				todo.title = todo.title.trim();
				if (!todo.title) {
					this.removeTodo(todo);
				}
			},
			cancelEdit: function (todo) {
				this.editedTodo = null;
				todo.title = this.beforeEditCache;
			},
			removeCompleted: function () {
				this.todos = filters.active(this.todos);
			}
		},

		// 自定义指令
		directives: {
			'todo-focus': function (el, binding) {
				if (binding.value) {
					el.focus();
				}
			}
		}
	});

	// 应用程序启动后，将输入框聚焦
	app.$nextTick(function () {
		app.newTodo = '';
	});

	exports.app = app;

})(window);

这是一个使用了Vue.js框架的TodoMVC应用程序的JavaScript文件。其中定义了一些过滤器、计算属性、观察者、方法和自定义指令，用于实现TodoMVC应用程序的各种功能，比如添加、删除、编辑、筛选和保存待办事项等。

使用vue+elementUI+vuex 代码实现一个待办事项页面并包含以下功能 1.新增待办事项

2.删除待办事项 3.标记已完成待办事项 4.编辑待办事项

首先，需要安装Vue、ElementUI和Vuex。

npm install vue
npm install element-ui
npm install vuex

在main.js中引入Vue、ElementUI和Vuex：

import Vue from 'vue'
import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'
import Vuex from 'vuex'
import App from './App.vue'

Vue.use(ElementUI)
Vue.use(Vuex)

Vue.config.productionTip = false

new Vue({
  render: h => h(App),
}).$mount('#app')

接下来，创建store.js文件，定义state、mutations、actions和getters：

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    todos: [
      { id: 1, text: '写代码', done: false },
      { id: 2, text: '看电影', done: true },
      { id: 3, text: '做饭', done: false }
    ]
  },
  mutations: {
    addTodo (state, todo) {
      state.todos.push(todo)
    },
    deleteTodo (state, id) {
      state.todos = state.todos.filter(todo => todo.id !== id)
    },
    toggleTodo (state, id) {
      state.todos = state.todos.map(todo => {
        if (todo.id === id) {
          todo.done = !todo.done
        }
        return todo
      })
    },
    editTodo (state, todo) {
      state.todos = state.todos.map(item => (item.id === todo.id ? todo : item))
    }
  },
  actions: {
    addTodo ({ commit }, todo) {
      commit('addTodo', todo)
    },
    deleteTodo ({ commit }, id) {
      commit('deleteTodo', id)
    },
    toggleTodo ({ commit }, id) {
      commit('toggleTodo', id)
    },
    editTodo ({ commit }, todo) {
      commit('editTodo', todo)
    }
  },
  getters: {
    todos: state => state.todos,
    doneTodos: state => state.todos.filter(todo => todo.done),
    activeTodos: state => state.todos.filter(todo => !todo.done)
  }
})

在App.vue中，使用ElementUI的组件实现待办事项页面：

<template>
  <div class="container">
    <h1 class="title">Todo List</h1>
    <div class="add-todo">
      <el-input v-model="newTodo" placeholder="请输入待办事项"></el-input>
      <el-button type="primary" @click="addTodo">添加</el-button>
    </div>
    <el-divider></el-divider>
    <el-card v-for="todo in activeTodos" :key="todo.id" class="todo-card">
      <div class="todo-content">
        <el-checkbox v-model="todo.done" @change="toggleTodo" class="todo-checkbox">{{ todo.text }}</el-checkbox>
        <el-button-group>
          <el-button type="text" @click="editTodo">编辑</el-button>
          <el-button type="text" @click="deleteTodo">删除</el-button>
        </el-button-group>
      </div>
    </el-card>
    <el-divider></el-divider>
    <h2 class="subtitle">已完成</h2>
    <el-card v-for="todo in doneTodos" :key="todo.id" class="todo-card">
      <div class="todo-content">
        <el-checkbox v-model="todo.done" @change="toggleTodo" class="todo-checkbox">{{ todo.text }}</el-checkbox>
        <el-button-group>
          <el-button type="text" @click="editTodo">编辑</el-button>
          <el-button type="text" @click="deleteTodo">删除</el-button>
        </el-button-group>
      </div>
    </el-card>
    <el-dialog :visible.sync="editVisible" title="编辑待办事项">
      <el-input v-model="editTodoText" placeholder="请输入待办事项"></el-input>
      <div slot="footer">
        <el-button @click="editVisible = false">取消</el-button>
        <el-button type="primary" @click="saveEdit">保存</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { mapGetters, mapActions } from 'vuex'

export default {
  name: 'App',
  computed: {
    ...mapGetters(['activeTodos', 'doneTodos'])
  },
  data () {
    return {
      newTodo: '',
      editTodoId: null,
      editTodoText: '',
      editVisible: false
    }
  },
  methods: {
    ...mapActions(['addTodo', 'deleteTodo', 'toggleTodo', 'editTodo']),
    addTodo () {
      if (this.newTodo.trim()) {
        this.addTodo({
          id: Date.now(),
          text: this.newTodo,
          done: false
        })
        this.newTodo = ''
      }
    },
    deleteTodo (todo) {
      this.deleteTodo(todo.id)
    },
    toggleTodo (todo) {
      this.toggleTodo(todo.id)
    },
    editTodo (todo) {
      this.editTodoId = todo.id
      this.editTodoText = todo.text
      this.editVisible = true
    },
    saveEdit () {
      if (this.editTodoText.trim()) {
        this.editTodo({
          id: this.editTodoId,
          text: this.editTodoText,
          done: false
        })
        this.editVisible = false
      }
    }
  }
}
</script>

<style>
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.title {
  text-align: center;
  margin-bottom: 20px;
}

.add-todo {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}

.todo-card {
  margin-bottom: 10px;
}

.todo-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.todo-checkbox {
  flex: 1;
  margin-right: 10px;
}

.subtitle {
  margin-top: 20px;
  margin-bottom: 10px;
}
</style>

最后，在index.html中添加id为app的div：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Todo List</title>
  </head>
  <body>
    <div id="app"></div>
    <script src="./dist/js/app.js"></script>
  </body>
</html>

这样，就完成了一个基于Vue、ElementUI和Vuex的待办事项页面。