elcascader设置为可手动输入

要将 el-cascader 设置为可手动输入，可以通过设置 prop 属性 `filterable` 为 `true` 来实现。这样用户就可以在输入框中手动输入选项了。示例代码如下：

<el-cascader v-model="value" :options="options" :filterable="true" />

其中，`:filterable="true"` 表示启用可手动输入功能。这样用户就可以通过输入框手动输入选项了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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