挺有意思的，大家可以玩一玩儿：
前端代码如下：可以直接运行的代码。
<!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">
<title>优美的进度条</title>
<style>
.progress {
height: 25px;
width: 400px;
border-radius: 15px;
background-color: #272425;
border: 3px solid #272425;
box-sizing: border-box;
margin-bottom: 30px;
}
.inner {
width: 50%;
height: 20px;
border-radius: 10px;
text-align: right;
position: relative;
background-color: #409eff;
background-size: 20px 20px;
box-sizing: border-box;
transition: all 0.5s;
}
.inner span {
position: absolute;
right: -20px;
bottom: -25px;
}
</style>
</head>
<body>
<div id="app">
<!-- 进度条显示 -->
<div class="progress">
<div class="inner" :style="{ width: percent + '%'}">
<span> {{percent}} %</span>
</div>
</div>
<!-- 点击监听 -->
<button v-if="this.percent > 0" @click="add(-10)">进度减10%</button>
<button v-if="this.percent < 100" @click="add(10)">进度加10%</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
percent: 50
},
methods: {
add (a) {
this.percent += a;
//写个异步函数
if(this.percent === 100) {
setTimeout(function(){
alert('进度条完成啦！')
}, 500)
}
}
}
})
</script>
</body>
</html>
