html

<view class="imgItem" v-for="(defaultItem, defaultIndex) in showMyopenGroupList(myCreateGroup.teamCount,myCreateGroup.userGroups.length)" :key="defaultIndex">
</view>

js

showMyopenGroupList(totalNum, num) {
    let defaultNum = totalNum - num
    let arr = []
    for (let i = 0; i < defaultNum; i++) {
    arr.push(i)
    }
    return arr
},