<a :href="'/help/coupon?backurl=/my/coupons?'+encodeURIComponent('backurl=/my/')" target="_blank" rel="external nofollow" >
使用encodeURIComponent
<a :href="'/help/coupon?backurl=/my/coupons?'+encodeURIComponent('backurl=/my/')" target="_blank" rel="external nofollow" >
使用encodeURIComponent