用vue简单的实现点击按钮切换背景颜色，具体代码如下所示：
<div class=btnTitle>
<div class=btn-bg class={bg:time click=changeBg(3)>15天</div>
<div class=btn-bg class={bg:time click=changeBg(4)>30天</div>
</div>
<div class=btnTitle>
<div class=btn-bg :class={bg:increase == 5} @click=ch
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