el-select自适应行数

el-select默认情况下是不会自适应行数的。el-select的下拉菜单显示的选项数量是可以通过设置popper-class属性来控制的。你可以通过给el-select添加一个自定义的class，然后在CSS中设置该class的最大高度来实现自适应行数的效果。例如，你可以设置max-height为200px，这样下拉菜单最多显示5行选项。如果选项超过5行，就会出现滚动条。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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