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element-ui 中 Cascader 级联选择器有没有什么办法判断它是否

图片.png
图片.png
我想实现的效果是,一级选项如果全部选中的话,我就只用获取一级选项的值就行了,如果没有全部选中 我再获取二级选项的值

let checkArr = this.$refs.myref.getCheckedNodes()

checkArr = checkArr。filter(item => !(item.parent && item.parent.checked))
之后怎么把显示内容变为一级选项


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