[JavaScript知识库]vue案例（代办任务案例）

开发环境： vue2.6.11 + vue-cli4.5.13

使用工具：vscode,vue脚手架

使用技术：vue基础，css

案例描述：发起待办任务，勾选完成任务，查看任务状态，清除已完成的任务

css代码如下：

? ? ? ? base.css

hr {
	margin: 20px 0;
	border: 0;
	border-top: 1px dashed #c5c5c5;
	border-bottom: 1px dashed #f7f7f7;
}

.learn a {
	font-weight: normal;
	text-decoration: none;
	color: #b83f45;
}

.learn a:hover {
	text-decoration: underline;
	color: #787e7e;
}

.learn h3,
.learn h4,
.learn h5 {
	margin: 10px 0;
	font-weight: 500;
	line-height: 1.2;
	color: #000;
}

.learn h3 {
	font-size: 24px;
}

.learn h4 {
	font-size: 18px;
}

.learn h5 {
	margin-bottom: 0;
	font-size: 14px;
}

.learn ul {
	padding: 0;
	margin: 0 0 30px 25px;
}

.learn li {
	line-height: 20px;
}

.learn p {
	font-size: 15px;
	font-weight: 300;
	line-height: 1.3;
	margin-top: 0;
	margin-bottom: 0;
}

#issue-count {
	display: none;
}

.quote {
	border: none;
	margin: 20px 0 60px 0;
}

.quote p {
	font-style: italic;
}

.quote p:before {
	content: '“';
	font-size: 50px;
	opacity: .15;
	position: absolute;
	top: -20px;
	left: 3px;
}

.quote p:after {
	content: '”';
	font-size: 50px;
	opacity: .15;
	position: absolute;
	bottom: -42px;
	right: 3px;
}

.quote footer {
	position: absolute;
	bottom: -40px;
	right: 0;
}

.quote footer img {
	border-radius: 3px;
}

.quote footer a {
	margin-left: 5px;
	vertical-align: middle;
}

.speech-bubble {
	position: relative;
	padding: 10px;
	background: rgba(0, 0, 0, .04);
	border-radius: 5px;
}

.speech-bubble:after {
	content: '';
	position: absolute;
	top: 100%;
	right: 30px;
	border: 13px solid transparent;
	border-top-color: rgba(0, 0, 0, .04);
}

.learn-bar > .learn {
	position: absolute;
	width: 272px;
	top: 8px;
	left: -300px;
	padding: 10px;
	border-radius: 5px;
	background-color: rgba(255, 255, 255, .6);
	transition-property: left;
	transition-duration: 500ms;
}

@media (min-width: 899px) {
	.learn-bar {
		width: auto;
		padding-left: 300px;
	}

	.learn-bar > .learn {
		left: 8px;
	}
}

? ? ? ? index.css

html,
body {
	margin: 0;
	padding: 0;
}

button {
	margin: 0;
	padding: 0;
	border: 0;
	background: none;
	font-size: 100%;
	vertical-align: baseline;
	font-family: inherit;
	font-weight: inherit;
	color: inherit;
	-webkit-appearance: none;
	appearance: none;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
	line-height: 1.4em;
	background: #f5f5f5;
	color: #111111;
	min-width: 230px;
	max-width: 550px;
	margin: 0 auto;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	font-weight: 300;
}

:focus {
	outline: 0;
}

.hidden {
	display: none;
}

.todoapp {
	background: #fff;
	margin: 130px 0 40px 0;
	position: relative;
	box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
	            0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp input::-webkit-input-placeholder {
	font-style: italic;
	font-weight: 300;
	color: rgba(0, 0, 0, 0.4);
}

.todoapp input::-moz-placeholder {
	font-style: italic;
	font-weight: 300;
	color: rgba(0, 0, 0, 0.4);
}

.todoapp input::input-placeholder {
	font-style: italic;
	font-weight: 300;
	color: rgba(0, 0, 0, 0.4);
}

.todoapp h1 {
	position: absolute;
	top: -140px;
	width: 100%;
	font-size: 80px;
	font-weight: 200;
	text-align: center;
	color: #b83f45;
	-webkit-text-rendering: optimizeLegibility;
	-moz-text-rendering: optimizeLegibility;
	text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
	position: relative;
	margin: 0;
	width: 100%;
	font-size: 24px;
	font-family: inherit;
	font-weight: inherit;
	line-height: 1.4em;
	color: inherit;
	padding: 6px;
	border: 1px solid #999;
	box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
	box-sizing: border-box;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

.new-todo {
	padding: 16px 16px 16px 60px;
	border: none;
	background: rgba(0, 0, 0, 0.003);
	box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}

.main {
	position: relative;
	z-index: 2;
	border-top: 1px solid #e6e6e6;
}

.toggle-all {
	width: 1px;
	height: 1px;
	border: none; /* Mobile Safari */
	opacity: 0;
	position: absolute;
	right: 100%;
	bottom: 100%;
}

.toggle-all + label {
	width: 60px;
	height: 34px;
	font-size: 0;
	position: absolute;
	top: 12px;
	left: -13px;
	-webkit-transform: rotate(90deg);
	transform: rotate(90deg);
	z-index: 9999
}

.toggle-all + label:before {
	content: '?';
	font-size: 22px;
	color: #e6e6e6;
	padding: 10px 27px 10px 27px;
}

.toggle-all:checked + label:before {
	color: #737373;
}

.todo-list {
	margin: 0;
	padding: 0;
	list-style: none;
}

.todo-list li {
	position: relative;
	font-size: 24px;
	border-bottom: 1px solid #ededed;
}

.todo-list li:last-child {
	border-bottom: none;
}

.todo-list li.editing {
	border-bottom: none;
	padding: 0;
}

.todo-list li.editing .edit {
	display: block;
	width: calc(100% - 43px);
	padding: 12px 16px;
	margin: 0 0 0 43px;
}

.todo-list li.editing .view {
	display: none;
}

.todo-list li .toggle {
	text-align: center;
	width: 40px;
	/* auto, since non-WebKit browsers doesn't support input styling */
	height: auto;
	position: absolute;
	top: 0;
	bottom: 0;
	margin: auto 0;
	border: none; /* Mobile Safari */
	-webkit-appearance: none;
	appearance: none;
}

.todo-list li .toggle {
	opacity: 0;
}

.todo-list li .toggle + label {
	/*
		Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
		IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
	*/
	background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
	background-repeat: no-repeat;
	background-position: center left;
}

.todo-list li .toggle:checked + label {
	background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
}

.todo-list li label {
	word-break: break-all;
	padding: 15px 15px 15px 60px;
	display: block;
	line-height: 1.2;
	transition: color 0.4s;
	font-weight: 400;
	color: #4d4d4d;
}

.todo-list li.completed label {
	color: #cdcdcd;
	text-decoration: line-through;
}

.todo-list li .destroy {
	display: none;
	position: absolute;
	top: 0;
	right: 10px;
	bottom: 0;
	width: 40px;
	height: 40px;
	margin: auto 0;
	font-size: 30px;
	color: #cc9a9a;
	margin-bottom: 11px;
	transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
	color: #af5b5e;
}

.todo-list li .destroy:after {
	content: '×';
}

.todo-list li:hover .destroy {
	display: block;
}

.todo-list li .edit {
	display: none;
}

.todo-list li.editing:last-child {
	margin-bottom: -1px;
}

.footer {
	padding: 10px 15px;
	height: 20px;
	text-align: center;
	font-size: 15px;
	border-top: 1px solid #e6e6e6;
}

.footer:before {
	content: '';
	position: absolute;
	right: 0;
	bottom: 0;
	left: 0;
	height: 50px;
	overflow: hidden;
	box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
	            0 8px 0 -3px #f6f6f6,
	            0 9px 1px -3px rgba(0, 0, 0, 0.2),
	            0 16px 0 -6px #f6f6f6,
	            0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
	float: left;
	text-align: left;
}

.todo-count strong {
	font-weight: 300;
}

.filters {
	margin: 0;
	padding: 0;
	list-style: none;
	position: absolute;
	right: 0;
	left: 0;
}

.filters li {
	display: inline;
}

.filters li a {
	color: inherit;
	margin: 3px;
	padding: 3px 7px;
	text-decoration: none;
	border: 1px solid transparent;
	border-radius: 3px;
}

.filters li a:hover {
	border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
	border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
	float: right;
	position: relative;
	line-height: 20px;
	text-decoration: none;
	cursor: pointer;
}

.clear-completed:hover {
	text-decoration: underline;
}

.info {
	margin: 65px auto 0;
	color: #4d4d4d;
	font-size: 11px;
	text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
	text-align: center;
}

.info p {
	line-height: 1;
}

.info a {
	color: inherit;
	text-decoration: none;
	font-weight: 400;
}

.info a:hover {
	text-decoration: underline;
}

/*
	Hack to remove background from Mobile Safari.
	Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
	.toggle-all,
	.todo-list li .toggle {
		background: none;
	}

	.todo-list li .toggle {
		height: 40px;
	}
}

@media (max-width: 430px) {
	.footer {
		height: 50px;
	}

	.filters {
		bottom: 10px;
	}
}

App.vue

<template>
  <div>
    <div class="todoapp">
      <TodoHeader
        @addEvent="addFn"
        :arr="showArr"
        @complateEvent="completeFn"
      ></TodoHeader>
      <TodoMain :arr="showArr" @delEvent="delFn"></TodoMain>
      <TodoFooter
        :arr="showArr"
        @changeEvent="changeFn"
        @cleatEvent="clearFn"
      ></TodoFooter>
    </div>
  </div>
</template>

<script>
import "./styles/base.css";
import "./styles/index.css";

//引入组件
import TodoHeader from "./components/TodoHeader.vue";
import TodoMain from "./components/TodoMain";
import TodoFooter from "./components/TodoFooter";
export default {
  data() {
    return {
      // list: [
      //   { id: 100, name: "吃饭", isDone: true },
      //   { id: 201, name: "睡觉", isDone: false },
      //   { id: 103, name: "打豆豆", isDone: true },
      // ],
      list: JSON.parse(localStorage.getItem("todoList")) || [],
      isStr: "all",
    };
  },
  methods: {
    //添加
    addFn(todoName) {
      let theId =
        this.list.length === 0 ? 1 : this.list[this.list.length - 1] + 1;
      this.list.push({
        id: theId,
        name: todoName,
        isDone: false,
      });
    },
    //删除
    delFn(id) {
      let index = this.list.findIndex((obj) => obj.id === id);
      this.list.splice(index, 1);
    },
    //状态栏切换
    changeFn(str) {
      this.isStr = str;
    },
    //清除已完成
    clearFn() {
      this.list = this.list.filter((obj) => obj.isDone === false);
    },
    //全选控制小选
    completeFn(bool) {
      this.list.forEach((obj) => {
        obj.isDone = bool;
      });
    },
  },
  computed: {
    //切换状态栏渲染对应数据
    showArr() {
      if (this.isStr === "yes") {
        return this.list.filter((obj) => obj.isDone === true);
      } else if (this.isStr === "no") {
        return this.list.filter((obj) => obj.isDone === false);
      } else {
        return this.list;
      }
    },
  },
  //注册组件
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  watch: {
    list: {
      deep: true,
      handler() {
        //只要list改变，这里就会侦听到马上出发
        //吧list缓存到本地
        localStorage.setItem("todoList", JSON.stringify(this.list));
      },
    },
  },
};
</script>

<style>
</style>

组件代码如下：

TodoHeader.vue

<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll" />
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keyup.enter="addFn"
      v-model="todoName"
    />
  </header>
</template>

<script>
export default {
  data() {
    return {
      todoName: "",
    };
  },
  methods: {
    //添加
    addFn() {
      if (this.todoName.trim().length === 0) {
        return alert("请输入任务名");
      }
      this.$emit("addEvent", this.todoName);
      this.todoName = "";
    },
  },
  props: ["arr"],
  computed: {
    isAll: {
      set(val) {
        this.$emit("complateEvent", val);
      },
      get() {
        return this.arr.every((obj) => obj.isDone === true);
      },
    },
  },
};
</script>

?TodoMain.vue

<template>
  <ul class="todo-list">
    <!-- completed: 完成的类名 -->
    <li :class="{ completed: obj.isDone }" v-for="obj in arr" :key="obj.id">
      <div class="view">
        <input class="toggle" type="checkbox" v-model="obj.isDone" />
        <label>{{ obj.name }}</label>
        <button class="destroy" @click="delFn(obj.id)"></button>
      </div>
    </li>
  </ul>
</template>

<script>
export default {
  props: ["arr"],
  methods: {
    //删除
    delFn(theId) {
      this.$emit("delEvent", theId);
    },
  },
};
</script>

TodoFooter.vue

<template>
  <footer class="footer">
    <span class="todo-count"
      >剩余<strong>{{ arr.length }}</strong></span
    >
    <ul class="filters">
      <li>
        <a
          :class="{ selected: isH === 'all' }"
          href="javascript:;"
          @click="changeFn('all')"
          >全部</a
        >
      </li>
      <li>
        <a
          :class="{ selected: isH === 'no' }"
          href="javascript:;"
          @click="changeFn('no')"
          >未完成</a
        >
      </li>
      <li>
        <a
          :class="{ selected: isH === 'yes' }"
          href="javascript:;"
          @click="changeFn('yes')"
          >已完成</a
        >
      </li>
    </ul>
    <button class="clear-completed" @click="clearFn">清除已完成</button>
  </footer>
</template>

<script>
export default {
  props: ["arr"],
  data() {
    return {
      isH: "",
    };
  },
  methods: {
    //状态栏切换
    changeFn(theStr) {
      this.isH = theStr; //将changeFn()的参数复制给this.isH
      this.$emit("changeEvent", theStr); //将changeFn()的参数传给父组件
    },
    //清除已完成
    clearFn() {
      this.$emit("cleatEvent");
    },
  },
};
</script>

?vue.config.js

module.exports = {
    devServer: { // 自定义服务配置
      open: true, // 自动打开浏览器
      port: 8888
  },
  lintOnSave:false,  //关闭eslint检查
  publicPath:'./'
  }