ElementUI，修改el-cascader的默认样式_el-zoom-in-top-enter-active样式与el-cascader

Element UI 中的下拉弹窗是通过在整个body标签末尾动态添加div实现的，所以修改样式时，必须要定义全局样式才能实现样式覆盖，那怎样才能避免全局的样式污染呢？

解决办法：通过给组件添加自定义的 popper-class 属性来避免全局样式污染；

<el-cascader
    v-model="showOptions"
    style="height: 36px;width:260px"
    placeholder="显示选项"
    :options="optionsList"
    :props="props"
    collapse-tags
    clearable
    popper-class="dropDownPanel"
></el-cascader>
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下拉框的样式设置：

<style>
.dropDownPanel{
    background: #123493;
    border: 1px solid rgba(57,106,254,1);
}
.dropDownPanel[x-placement^=bottom] .popper__arrow {
    display: none;
}
.dropDownPanel .el-cascader-menu {
    color: #fff;
    border-right: 1px solid rgba(57,106,254,1);
}
.dropDownPanel .el-cascader-node.in-active-path {
    color: #38B4C1;
    /* background: transparent; */
}
.dropDownPanel .el-cascader-node.is-active {
    color: #38B4C1;
}
.dropDownPanel .el-cascader-node:not(.is-disabled):focus, 
.dropDownPanel .el-cascader-node:not(.is-disabled):hover {
    background-color: #0C0F56!important;
}
</style>
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样式修改

<style scoped>
/deep/ .el-tag.el-tag--info {
    background-color: #123493;
    border-color: rgba(57,106,254,1);
    color: #FFFFFF;
}
/deep/ .el-cascader__tags .el-tag:not(.is-hit) {
    border-color: rgba(57,106,254,1);
}
</style>
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