vuejs绑定class和style样式写四个按钮

可以这样实现：

<template>
  <div>
    <button :class="{ active: activeIndex === 1 }" @click="activeIndex = 1">Button 1</button>
    <button :class="{ active: activeIndex === 2 }" @click="activeIndex = 2">Button 2</button>
    <button :class="{ active: activeIndex === 3 }" @click="activeIndex = 3">Button 3</button>
    <button :class="{ active: activeIndex === 4 }" @click="activeIndex = 4">Button 4</button>

    <div :style="`background-color: ${color}; font-size: ${fontSize}px;`">
      Style Me!
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      activeIndex: 1,
      color: 'red',
      fontSize: 16,
    };
  },
};
</script>

<style>
.active {
  background-color: blue;
  color: white;
}

div {
  padding: 20px;
  text-align: center;
}
</style>

在上面的代码中，我们使用`:class`和`:style`指令来绑定类和样式。`:class`指令使用对象语法，根据`activeIndex`的值来动态添加或删除`active`类。`:style`指令使用模板字符串，根据`color`和`fontSize`的值来动态计算样式。