在el-dialog中设置必填校验

在el-dialog中设置必填校验，可以通过在el-form-item中使用required属性来实现。例如，可以在el-form-item的rules属性中设置校验规则：

<el-form-item label="收货人" prop="receiver">
  <el-input v-model="receiver"></el-input>
</el-form-item>

设置required校验规则：

<el-form-item label="收货人" prop="receiver" :rules="[{ required: true, message: '请输入收货人', trigger: 'blur' }]">
  <el-input v-model="receiver"></el-input>
</el-form-item>

其中，required为true表示必填，message为提示信息，trigger为触发校验的方式，这里使用blur表示失去焦点时触发校验。你可以根据需要修改这些属性来满足你的实际需求。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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