cascader组件当渲染数据太多时，会超出浏览器边界
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Description
显示效果：[https://s1.ax1x.com/2020/03/16/8Yseqe.gif](https://s1.ax1x.com/2020/03/16/8Yseqe.gif)
解决办法：给el-cascader-panel添加一个样式
`.el-cascader-panel {
height: 50vh;
}`
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