Vue2 样式控制案例v-bind控制style

<
  !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>Document</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 1s;
    }
    .inner span {
      position: absolute;
      right: -20px;
      bottom: -25px;
    }
  </style>
</head>
<body>
  <div id="app">
    <!-- 外层盒子 -->
    <div class="progress">
      <!-- 内层盒子 -->
      <div class="inner" :style="{width: percent+'%'}">
        <span>{{percent}}%</span>
      </div>
    </div>
    <button v-on:click="percent=25">设置25%</button>
    <button v-on:click="percent=50">设置50%</button>
    <button v-on:click="percent=75">设置75%</button>
    <button v-on:click="percent=100">设置100%</button>
  </div>
  <script src="//i2.wp.com/cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        percent:50,
      }
    })
  </script>
</body>
</html>