<a-form-item label="产品特性" class="am-enter_form_item"><a-select mode="tags"class="am-enter-select"placeholder="选择或填写2~4个标签（限制2~4个字）"showArrow:max-tag-count="4":max-tag-text-length="4"v-decorator="['productFeature', { rules: [{ required: true, message: '请输入产品特性'},{validator: selectTagChange}] }]"><a-select-option value="额度高">额度高</a-select-option><a-select-option value="利率低">利率低</a-select-option><a-select-option value="期限长">期限长</a-select-option><a-select-option value="放款快">放款快</a-select-option><a-select-option value="极速审批">极速审批</a-select-option></a-select></a-form-item>

在methods中写

selectTagChange: function (rule, value, callback) {var status = trueif (!value) {//特别注意在为空时校验规则已写，所以这儿照样callback()，不然不会执行空时的校验callback()} else {if (value.length <= 4 && value.length >= 2) {value.map(function (item) {if (item.length > 4 || item.length < 2) {status = falsereturn}})if (!status) {callback('选择或填写2~4个标签（限制2~4个字）')} else {callback()}} else {callback('选择或填写2~4个标签（限制2~4个字）')}}},