下面的代码可直接运行：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="./score.css" />
<title>Document</title>
</head>
<body>
<div id="app" class="score-case">
<div class="table">
<table>
<thead>
<tr>
<th>编号</th>
<th>科目</th>
<th>成绩</th>
<th>操作</th>
</tr>
</thead>
<tbody v-if = "list.length > 0">
<tr v-for = "(item, index) in list" :key="item.id">
<td>{
{ index + 1 }}</td>
<td>{
{ item.subject }}</td>
<td :class="{red : item.score < 60}">{
{ item.score }}</td>
<td><a @click.prevent="del(item.id)" href="http://www.baidu.com">删除</a></td>
</tr>
</tbody>
<tbody v-else>
<tr>
<td colspan="5">
<span class="none">暂无数据</span>
</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="5">
<span>总分：{
{totalScore}} </span>
<span style="margin-left: 50px">平均分：{
{averageScore}} </span>
</td>
</tr>
</tfoot>
</table>
</div>
<div class="form">
<div class="form-item">
<div class="label">科目：</div>
<div class="input">
<input
type="text"
placeholder="请输入科目"
v-model.trim = "subject"
/><!-- 去除首尾的空格 -->
</div>
</div>
<div class="form-item">
<div class="label">分数：</div>
<div class="input">
<input
type="text"
placeholder="请输入分数"
v-model.number = "score"
/>
</div>
</div>
<div class="form-item">
<div class="label"></div>
<div class="input">
<button @click="add" class="submit" >添加</button>
</div>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
list: [
{ id: 1, subject: '政治', score: 82 },
{ id: 7, subject: '数学', score: 139 },
{ id: 12, subject: '英语', score: 72 },
{ id: 16, subject: '408', score: 135 },
],
subject: '',
score: ''
},
computed: {
totalScore() {
return this.list.reduce((sum, item) => sum + item.score, 0)
},
averageScore () {
if (this.list.length === 0) {
return 0
}
return (this.totalScore / this.list.length).toFixed(2)
}
},
methods: {
del(id) {
this.list = this.list.filter(item => item.id != id)
},
add() {
if(!this.subject) {
alert('请输入科目')
return
}
if(typeof this.score !== 'number') {
alert('请输入正确的成绩')
return
}
this.list.unshift({
id: +new Date(),
subject: this.subject,
score: this.score
})
this.subject = ''
this.score = ''
}
}
})
</script>
</body>
</html>
下面是css代码:
.score-case {
width: 1000px;
margin: 50px auto;
display: flex;
}
.score-case .table {
flex: 4;
}
.score-case .table table {
width: 100%;
border-spacing: 0;
border-top: 1px solid #ccc;
border-left: 1px solid #ccc;
}
.score-case .table table th {
background: #f5f5f5;
}
.score-case .table table tr:hover td {
background: #f5f5f5;
}
.score-case .table table td,
.score-case .table table th {
border-bottom: 1px solid #ccc;
border-right: 1px solid #ccc;
text-align: center;
padding: 10px;
}
.score-case .table table td.red,
.score-case .table table th.red {
color: red;
}
.score-case .table .none {
height: 100px;
line-height: 100px;
color: #999;
}
.score-case .form {
flex: 1;
padding: 20px;
}
.score-case .form .form-item {
display: flex;
margin-bottom: 20px;
align-items: center;
}
.score-case .form .form-item .label {
width: 60px;
text-align: right;
font-size: 14px;
}
.score-case .form .form-item .input {
flex: 1;
}
.score-case .form .form-item input,
.score-case .form .form-item select {
appearance: none;
outline: none;
border: 1px solid #ccc;
width: 200px;
height: 40px;
box-sizing: border-box;
padding: 10px;
color: #666;
}
.score-case .form .form-item input::placeholder {
color: #666;
}
.score-case .form .form-item .cancel,
.score-case .form .form-item .submit {
appearance: none;
outline: none;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 10px;
margin-right: 10px;
font-size: 12px;
background: #ccc;
}
.score-case .form .form-item .submit {
border-color: #069;
background: #069;
color: #fff;
}