因为是在表单里写的,所以有点迷,不知道要怎么写..
请大神给个思路~~~

<a-form-item v-bind="formStyle" label="别名(英文)">
    <a-input
        placeholder="请输入别名"
        v-decorator="['menuPath', { rules: [
            { required: true, message: '请输入别名' },
            { validator: (rule, value, cb) => this.changeKey(rule, value, cb) }
        ] }]"
    />
</a-form-item>

把采纳给了楼下
我现在的解决办法如下: 感觉这样更方便点儿

 <a-form-item v-bind="formStyle" label="别名(英文)">
    <a-input
        placeholder="请输入别名"
        maxlength="50"
        minlength="3"
        v-decorator="['menuPath', { rules: [
            { required: true, message: '请输入别名' }
        ],
            getValueFromEvent: (event) => {
                return event.target.value.replace(/[\u4E00-\u9FA5]/g,'')
            }
         }]"
    />
</a-form-item>