1、在el-cascader里添加expand-change、visible-change事件里添加这段代码
` this.$nextTick(() => {
// 添加这段代码
const $el = document.querySelectorAll(
'.el-cascader-panel .el-cascader-node[aria-owns]'
)
Array.from($el).map(item => item.removeAttribute('aria-owns'))
})`