el-select取消默认选中第一个

要取消el-select的默认选中第一个选项，可以将v-model的值设置为null或者空字符串。在给el-select绑定v-model的地方，将v-model的值设为null或者空字符串即可取消默认选中第一个选项。例如，将this.queryParam.receiveObject = this.objectSelectOptions<span class="em">1</span><span class="em">2</span>
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