vue侦听器,自定义指令,计算属性,过滤器,生命周期函数使用示例

在这里插入代码片

<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Documenttitle>
  <style type="text/css">
    .grid {
      
      margin: auto;
      width: 530px;
      text-align: center;
    }
    .grid table {
      
      border-top: 1px solid #C2D89A;
      width: 100%;
      border-collapse: collapse;
    }
    .grid th,td {
      
      padding: 10;
      border: 1px dashed #F3DCAB;
      height: 35px;
      line-height: 35px;
    }
    .grid th {
      
      background-color: #F3DCAB;
    }
    .grid .book {
      
      padding-bottom: 10px;
      padding-top: 5px;
      background-color: #F3DCAB;
    }
    .grid .total {
      
      height: 30px;
      line-height: 30px;
      background-color: #F3DCAB;
      border-top: 1px solid #C2D89A;
    }
  style>
head>
<body>
  <div id="app">
    <div class="grid">
      <div>
        <h1>图书管理h1>
        <div class="book">
          <div>
            <label for="id">
              编号:
            label>
            <input type="text" id="id" v-model='id' :disabled="flag" v-focus>
            <label for="name">
              名称:
            label>
            <input type="text" id="name" v-model='name'>
            <button @click='handle' :disabled="submitFlag">提交button>
          div>
        div>
      div>
      <div class="total">
        <span>图书总数:span>
        <span>{
    {total}}span>
      div>
      <table>
        <thead>
          <tr>
            <th>编号th>
            <th>名称th>
            <th>时间th>
            <th>操作th>
          tr>
        thead>
        <tbody>
          <tr :key='item.id' v-for='item in books'>
            <td>{
    {item.id}}td>
            <td>{
    {item.name}}td>
            <td>{
    {item.date | format('yyyy-MM-dd hh:mm:ss')}}td>
            <td>
              <a href="" @click.prevent='toEdit(item.id)'>修改a>
              <span>|span>
              <a href="" @click.prevent='deleteBook(item.id)'>删除a>
            td>
          tr>
        tbody>
      table>
    div>
  div>
  <script type="text/javascript" src="js/vue.js">script>
  <script type="text/javascript">
    /*
      图书管理-添加图书
    */
    Vue.directive('focus', {
      
      inserted: function (el) {
      
        el.focus();
      }
    });
    Vue.filter('format', function(value, arg) {
      
      function dateFormat(date, format) {
      
        if (typeof date === "string") {
      
          var mts = date.match(/(\/Date\((\d+)\)\/)/);
          if (mts && mts.length >= 3) {
      
            date = parseInt(mts[2]);
          }
        }
        date = new Date(date);
        if (!date || date.toUTCString() == "Invalid Date") {
      
          return "";
        }
        var map = {
      
          "M": date.getMonth() + 1, //月份 
          "d": date.getDate(), //日 
          "h": date.getHours(), //小时 
          "m": date.getMinutes(), //分 
          "s": date.getSeconds(), //秒 
          "q": Math.floor((date.getMonth() + 3) / 3), //季度 
          "S": date.getMilliseconds() //毫秒 
        };
        format = format.replace(/([yMdhmsqS])+/g, function(all, t) {
      
          var v = map[t];
          if (v !== undefined) {
      
            if (all.length > 1) {
      
              v = '0' + v;
              v = v.substr(v.length - 2);
            }
            return v;
          } else if (t === 'y') {
      
            return (date.getFullYear() + '').substr(4 - all.length);
          }
          return all;
        });
        return format;
      }
      return dateFormat(value, arg);
    })
    var vm = new Vue({
      
      el: '#app',
      data: {
      
        flag: false,
        submitFlag: false,
        id: '',
        name: '',
        books: []
      },
      methods: {
      
        handle: function(){
      
          if(this.flag) {
      
            // 编辑图书
            // 就是根据当前的ID去更新数组中对应的数据
            this.books.some((item) => {
      
              if(item.id == this.id) {
      
                item.name = this.name;
                // 完成更新操作之后,需要终止循环
                return true;
              }
            });
            this.flag = false;
          }else{
      
            // 添加图书
            var book = {
      };
            book.id = this.id;
            book.name = this.name;
            book.date = 2525609975000;
            this.books.push(book);
            // 清空表单
            this.id = '';
            this.name = '';
          }
          // 清空表单
          this.id = '';
          this.name = '';
        },
        toEdit: function(id){
      
          // 禁止修改ID
          this.flag = true;
          console.log(id)
          // 根据ID查询出要编辑的数据
          var book = this.books.filter(function(item){
      
            return item.id == id;
          });
          console.log(book)
          // 把获取到的信息填充到表单
          this.id = book[0].id;
          this.name = book[0].name;
        },
        deleteBook: function(id){
      
          // 删除图书
          // 根据id从数组中查找元素的索引
          // var index = this.books.findIndex(function(item){
      
          //   return item.id == id;
          // });
          // 根据索引删除数组元素
          // this.books.splice(index, 1);
          // -------------------------
          // 方法二:通过filter方法进行删除
          this.books = this.books.filter(function(item){
      
            return item.id != id;
          });
        }
      },
      computed: {
      
        total: function(){
      
          // 计算图书的总数
          return this.books.length;
        }
      },
      watch: {
      
        name: function(val) {
      
          // 验证图书名称是否已经存在
          var flag = this.books.some(function(item){
      
            return item.name == val;
          });
          if(flag) {
      
            // 图书名称存在
            this.submitFlag = true;
          }else{
      
            // 图书名称不存在
            this.submitFlag = false;
          }
        }
      },
      mounted: function(){
      
        // 该生命周期钩子函数被触发的时候,模板已经可以使用
        // 一般此时用于获取后台数据,然后把数据填充到模板
        var data = [{
      
          id: 1,
          name: '三国演义',
          date: 2525609975000
        },{
      
          id: 2,
          name: '水浒传',
          date: 2525609975000
        },{
      
          id: 3,
          name: '红楼梦',
          date: 2525609975000
        },{
      
          id: 4,
          name: '西游记',
          date: 2525609975000
        }];
        this.books = data;
      }
    });
  script>
body>
html>

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