[JavaScript知识库]vue练习 todoList

目录

实现效果

vue2

VUE3

vue3 监听watch

所有样式

实现效果

vue2

<template>
  <section class="todoapp">
    <!-- 头部输入框区域 -->
    <header class="header">
      <h1>todos</h1>
      <input
        class="new-todo"
        v-model="text"
        @keyup.enter="addList"
        placeholder="请输入要完成的任务"
        autofocus
      />
    </header>
    <section class="main">
      <!-- 全选切换input -->
      <input
        id="toggle-all"
        v-model="allCurrent"
        @click="toggleAll"
        class="toggle-all"
        type="checkbox"
      />
      <label for="toggle-all">标记所有已经完成</label>
      <ul class="todo-list">
        <!-- 任务列表 -->
        <li v-for="(item, idx) in list" :key="item.id">
          <div class="view">
            <input class="toggle" type="checkbox" v-model="item.isRight" />
            <label> {{ item.todo }} </label>
            <button @click="list.splice(idx, 1)" class="destroy"></button>
          </div>
        </li>
      </ul>
    </section>
    <footer class="footer">
      <span class="todo-count">
        还未完成的任务有:<strong> {{ unTodo }} </strong>项
      </span>
    </footer>
  </section>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { id: 1, todo: "吃饭", isRight: true },
        { id: 1, todo: "睡觉", isRight: false },
      ],
      text:''
    };
  },
  methods: {
      addList() {
           this.list.unshift({ id: new Date(), todo: this.text, isRight: false });
  },
  },
  computed: {
      // 判断还有多少未完成
      unTodo() {
        return this.list.filter(item=>item.isRight===false).length
      },
    //   全选
      allCurrent:{
          set(val){
              return this.list.forEach(item=>item.isRight=val)
          },
          get(){
        return this.list.every(item=>item.isRight===true)
          }
      }
  },
}
</script>

VUE3

<template>
  <section class="todoapp">
    <!-- 头部输入框区域 -->
    <header class="header">
      <h1>todos</h1>
      <input
        class="new-todo"
        v-model="text"
        @keyup.enter="addList"
        placeholder="请输入要完成的任务"
        autofocus
      />
    </header>
    <section class="main">
      <!-- 全选切换input -->
      <input
        id="toggle-all"
        v-model="allCurrent"
        class="toggle-all"
        type="checkbox"
      />
      <label for="toggle-all">标记所有已经完成</label>
      <ul class="todo-list">
        <!-- 任务列表 -->
        <li v-for="(item, idx) in list" :key="item.id">
          <div class="view">
            <input class="toggle" type="checkbox" v-model="item.isRight" />
            <label> {{ item.todo }} </label>
            <button @click="list.splice(idx, 1)" class="destroy"></button>
          </div>
        </li>
      </ul>
    </section>
    <footer class="footer">
      <span class="todo-count">
        还未完成的任务有:<strong> {{ unTodo }} </strong>项
      </span>
    </footer>
  </section>
</template>
<script>
import { computed, ref } from "vue";
export default {
  setup() {
    // 定义数据
    const list = ref([
      { id: 1, todo: "吃饭", isRight: true },
      { id: 1, todo: "睡觉", isRight: false },
    ]);
    // 定义输入内容
    const text = ref("");
    // 添加内容
    const addList = () =>
      list.value.unshift({ id: new Date(), todo: text, isRight: false });
    // 判断还有多少未完成
    let unTodo = computed(() => {
      return list.value.filter((item) => item.isRight === false).length;
    });

    // 全选
    const allCurrent = computed({
        // 我等于true 所有人都等于true
      set(val) {
        return list.value.forEach((item) => (item.isRight = val));
      },
    //   所有状态都为true 我就是true
      get() {
        return list.value.every((item) => item.isRight);
      },
    });

    return { list, unTodo, text, addList,allCurrent };
  },
};
</script>

vue3 监听watch

<template>
  <section class="todoapp">
    <!-- 头部输入框区域 -->
    <header class="header">
      <h1>todos</h1>
      <input
        class="new-todo"
        v-model="text"
        @keyup.enter="addList"
        placeholder="请输入要完成的任务"
        autofocus
      />
    </header>
    <section class="main">
      <!-- 全选切换input -->
      <input
        id="toggle-all"
        v-model="allCurrent"
        @click="toggleAll"
        class="toggle-all"
        type="checkbox"
      />
      <label for="toggle-all">标记所有已经完成</label>
      <ul class="todo-list">
        <!-- 任务列表 -->
        <li v-for="(item, idx) in list" :key="item.id">
          <div class="view">
            <input class="toggle" type="checkbox" v-model="item.isRight" />
            <label> {{ item.todo }} </label>
            <button @click="list.splice(idx, 1)" class="destroy"></button>
          </div>
        </li>
      </ul>
    </section>
    <footer class="footer">
      <span class="todo-count">
        还未完成的任务有:<strong> {{ unTodo }} </strong>项
      </span>
    </footer>
  </section>
</template>
<script>
import { computed, ref, watch } from "vue";
export default {
  setup() {
    // 定义数据
    const list = ref([
      { id: 1, todo: "吃饭", isRight: true },
      { id: 1, todo: "睡觉", isRight: false },
    ]);
    // 定义输入内容
    const text = ref("");
    // 添加内容
    const addList = () =>
      list.value.unshift({ id: new Date(), todo: text, isRight: false });
    // 判断还有多少未完成
    let unTodo = computed(() => {
      return list.value.filter((item) => item.isRight === false).length;
    });
    //  watch监听
    // 当前状态
    //  所有状态都为true 我就是true
    let allCurrent = ref(false);
    watch(
      list,
      (newValue) => {
      console.log(newValue.every((item) => item.isRight))

        if (newValue.every((item) => item.isRight)) {
           (allCurrent.value = true);
        } else {
           (allCurrent.value = false);
        }
      },
      { immediate: true, deep: true }
    );


    // 切换按钮
    const toggleAll =()=>{
    if(!allCurrent.value){
        list.value.forEach(item => item.isRight=true)
    }else{
      list.value.forEach(item => item.isRight=false)
    }};
    return { list, unTodo, text, addList, allCurrent,toggleAll };
  },
};
</script>

所有样式

<style>
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: -52px;
  left: -13px;
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}

.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 {
  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;
  }
}
</style>