ant design vue 日期选择器只选择年份

<a-form-model :model="form" :label-col="labelCol" :wrapper-col="wrapperCol">
            <a-form-model-item label="年度/季度" >
                <a-date-picker 
                mode="year" 
                placeholder="请选择年份" 
                format=‘YYYY‘ 
                v-model="form.yearQuarter"  
                style="width:100%"
                :open=‘yearShowOne‘  
                @openChange="openChangeOne" 
                @panelChange="panelChangeOne"/>
            </a-form-model-item>
</a-form-model>

methods: {
     // 弹出日历和关闭日历的回调
      openChangeOne(status) {
            if (status){
                this.yearShowOne =  true
            }
        },
     // 得到年份选择器的值
     panelChangeOne(value) {
            this.form.yearQuarter = value;
            this.yearShowOne = false;
        }
}