el-cascader change事件

el-cascader的change事件是在最后一级选项被选中时触发的事件。当用户选择完最后一级选项后，change事件会返回一个包含所有选项值的数组作为参数传递给相应的函数。通过这个change事件，我们可以获取用户选择的最终数值并进行相应的操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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