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vue动态绑定:class,值改变,但并未动态添加类目

大概的代码,简而言之就是一个收藏按钮状态切换
image.png

<span
    class="icon-star"
    :class='{ "active" : result.isCollection==true}'
    @click="collectionHandler(result.isCollection)"
    >
</span>
collectionHandler(isCollection) {
  this.$set(this.result, 'isCollection', !isCollection)
  console.log(this.result.isCollection)
}

通过控制台可以判断当前 result.isCollection 的值是根据点击在动态变化的,但是:class绑定的类并没有动态添加,想问是什么原因?


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by (71.8m points)
:class='{ "active" : result.isCollection}'

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