uniapp 拒绝调用相机怎么再次唤起提示打开权限

<camera v-if="isShow" style="height: 520rpx" mode="scanCode" device-position="back" flash="off" @scancode="takeCode">
</camera>

data() {
return {
isShow:false,

}

}

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onShow() {             let that = this             uni.getSetting({                 success(res) {                     if (!res.authSetting['scope.camera']) {                         uni.authorize({                             scope: 'scope.camera',                             success(res) {                                 // 授权成功                                 uni.showToast({                                     title: '授权成功',                                     icon: 'none'                                 })                                 that.isShow = true                             },                             fail() {                                 uni.showModal({                                     content: '检测到您没打开获取相机功能权限，是否去设置打开？',                                     confirmText: "确认",                                     cancelText: '取消',                                     success: (res) => {                                         if (res.confirm) {                                             uni.openSetting({                                                 success: (res) => {                                                     uni.showToast({                                                         title: '授权成功',                                                         icon: 'none',                                                         duration:2000                                                     })                                                 },                                                 fail: (err) => {                                                     console.log(err)                                                 }                                             })                                         } else {                                             uni.showToast({                                                 title: '获取授权相机授权失败',                                                 icon: 'none',                                                 success: function() {                                                     uni.navigateBack()                                                 }                                             })                                         }                                     }                                 })                             }                         })                     }else{                         that.isShow = true                     }                 },                 fail() {                     uni.showToast({                         title: '获取授权相机授权失败',                         icon: 'none',                         success: function() {                             uni.navigateBack()                         }                     })                 }             })         },