学生信息表案例

目标：实现学生信息的增删，并将数据储存在本地

屏幕截图 2023-11-27 164429.png

录入模块

info.addEventListener('submit', function () {
    event.preventDefault()
    for (let i = 0; i < name.length; i++) {
      if (name[i].value === '') {
        return alert('输入内容不能为空')
      }
    }
    const obj = {
      stuId: arr.length + 1,
      uname: uname.value,
      age: age.value,
      gender: gender.value,
      salary: salary.value,
      city: city.value,
    }
    obj.stuId = arr.length ? arr[arr.length - 1].stuId + 1 : 1
    arr.push(obj)
    localStorage.setItem('data', JSON.stringify(arr))
    this.reset()
    render()
})

阻止默认提交

e.preventDefault()

非空判断

for (let i = 0; i < name.length; i++) {
  if (name[i].value === '') {
    return alert('输入内容不能为空')
  }
}

函数封装

function render() {
  tbody.innerHTML = ''
  for (let i = 0; i < arr.length; i++) {
    const tr = document.createElement('tr')
    tr.innerHTML = `<td>${arr[i].stuId}</td>
      <td>${arr[i].uname}</td>
      <td>${arr[i].age}</td>
      <td>${arr[i].gender}</td>
      <td>${arr[i].salary}</td>
      <td>${arr[i].city}</td>
      <td>
        <a href="javascript:" data-id=${i}>删除</a>
      </td>
    `
    tbody.appendChild(tr)
  }
}

删除模块

tbody.addEventListener('click', function (e) {
  if (e.target.tagName === 'A') {
    arr.splice(e.target.dataset.id, 1)
    localStorage.setItem('data', JSON.stringify(arr))
    render()
  }
})

代码实现

css

* {
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color:#721c24;
}
h1 {
  text-align: center;
  color:#333;
  margin: 20px 0;
 
}
table {
  margin:0 auto;
  width: 800px;
  border-collapse: collapse;
  color:#004085;
}
th {
  padding: 10px;
  background: #cfe5ff;
  
  font-size: 20px;
  font-weight: 400;
}
td,th {
  border:1px solid #b8daff;
}
td {
  padding:10px;
  color:#666;
  text-align: center;
  font-size: 16px;
}
tbody tr {
  background: #fff;
}
tbody tr:hover {
  background: #e1ecf8;
}
.info {
  width: 900px;
  margin: 50px auto;
  text-align: center;
}
.info  input, .info select {
  width: 80px;
  height: 27px;
  outline: none;
  border-radius: 5px;
  border:1px solid #b8daff;
  padding-left: 5px;
  box-sizing: border-box;
  margin-right: 15px;
}
.info button {
  width: 60px;
  height: 27px;
  background-color: #004085;
  outline: none;
  border: 0;
  color: #fff;
  cursor: pointer;
  border-radius: 5px;
}
.info .age {
  width: 50px;
}

html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>学生信息管理</title>
  <link rel="stylesheet" href="css/index.css" />
</head>

<body>
  <h1>新增学员</h1>
  <form class="info" autocomplete="off">
    姓名：<input type="text" class="uname" name="uname" />
    年龄：<input type="text" class="age" name="age" />
    性别:
    <select name="gender" class="gender">
      <option value="男">男</option>
      <option value="女">女</option>
    </select>
    薪资：<input type="text" class="salary" name="salary" />
    就业城市：<select name="city" class="city">
      <option value="北京">北京</option>
      <option value="上海">上海</option>
      <option value="广州">广州</option>
      <option value="深圳">深圳</option>
      <option value="曹县">曹县</option>
    </select>
    <button class="add">录入</button>
  </form>

  <h1>就业榜</h1>
  <table>
    <thead>
      <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>薪资</th>
        <th>就业城市</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody>
      <!-- 
        <tr>
          <td>1001</td>
          <td>欧阳霸天</td>
          <td>19</td>
          <td>男</td>
          <td>15000</td>
          <td>上海</td>
          <td>
            <a href="javascript:">删除</a>
          </td>
        </tr> 
        -->
    </tbody>
  </table>
  <script>
    const data = localStorage.getItem('data')
    const arr = data ? JSON.parse(data) : []
    const uname = document.querySelector('.uname')
    const age = document.querySelector('.age')
    const gender = document.querySelector('.gender')
    const salary = document.querySelector('.salary')
    const city = document.querySelector('.city')
    const tbody = document.querySelector('tbody')
    const name = document.querySelectorAll('[name]')
    const info = document.querySelector('.info')
    info.addEventListener('submit', function () {
      event.preventDefault()

      for (let i = 0; i < name.length; i++) {
        if (name[i].value === '') {
          return alert('输入内容不能为空')
        }
      }



      const obj = {
        stuId: arr.length + 1,
        uname: uname.value,
        age: age.value,
        gender: gender.value,
        salary: salary.value,
        city: city.value,
      }
      obj.stuId = arr.length ? arr[arr.length - 1].stuId + 1 : 1
      arr.push(obj)
      localStorage.setItem('data', JSON.stringify(arr))
      this.reset()
      render()
    })

    // 渲染函数
    function render() {
      tbody.innerHTML = ''
      for (let i = 0; i < arr.length; i++) {
        const tr = document.createElement('tr')
        tr.innerHTML = `<td>${arr[i].stuId}</td>
          <td>${arr[i].uname}</td>
          <td>${arr[i].age}</td>
          <td>${arr[i].gender}</td>
          <td>${arr[i].salary}</td>
          <td>${arr[i].city}</td>
          <td>
            <a href="javascript:" data-id=${i}>删除</a>
          </td>
        `
        tbody.appendChild(tr)
      }
    }
    render()
    // 删除模块
    tbody.addEventListener('click', function (e) {
      if (e.target.tagName === 'A') {
        arr.splice(e.target.dataset.id, 1)
        localStorage.setItem('data', JSON.stringify(arr))
        render()
      }
    })
  </script>
</body>

</html>