uniapp app获取相机权限，无权限时打开系统设置

            async checkPermission() {
                let system = uni.getSystemInfoSync()
                if (system.platform === 'ios') {
                    var result = false;
                    var AVCaptureDevice = plus.ios.import("AVCaptureDevice");
                    var authStatus = AVCaptureDevice.authorizationStatusForMediaType('vide');
                    console.log("authStatus:" + authStatus);
                    if (authStatus == 3 || authStatus == 0) {
                        //authStatus == 0 时为初次打开相机  ios系统有默认授权弹窗
                        result = true;
                        return result
                    } else {
                        uni.showModal({
                            title: '提示',
                            content: '请打开相机权限',
                            success(res) {
                                if (res.confirm) {
                                    var UIApplication = plus.ios.import("UIApplication");
                                    var application2 = UIApplication.sharedApplication();
                                    var NSURL2 = plus.ios.import("NSURL");
                                    var setting2 = NSURL2.URLWithString("app-settings:");
                                    application2.openURL(setting2);
                                    plus.ios.deleteObject(setting2);
                                    plus.ios.deleteObject(NSURL2);
                                    plus.ios.deleteObject(application2);
                                }
                            }
                        });
                    }
                    plus.ios.deleteObject(AVCaptureDevice);
                    return result;
                } else {
                    plus.android.requestPermissions(['android.permission.CAMERA'], (e) => {
                        if (e.deniedAlways.length > 0) { //权限被永久拒绝  
                            // 弹出提示框解释为何需要权限，引导用户打开设置页面开启  
                            uni.showModal({
                                title: '提示',
                                content: '请打开手机相机功能（点击确定后在权限中授权相机功能）',
                                // showCancel: false, // 不显示取消按钮
                                success(res) {
                                    if (res.confirm) {
                                        var Intent = plus.android.importClass("android.content.Intent");
                                        var Settings = plus.android.importClass(
                                            "android.provider.Settings");
                                        var Uri = plus.android.importClass("android.net.Uri");
                                        var mainActivity = plus.android.runtimeMainActivity();
                                        var intent = new Intent();
                                        intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                        var uri = Uri.fromParts("package", mainActivity.getPackageName(),
                                            null);
                                        intent.setData(uri);
                                        mainActivity.startActivity(intent);
                                    }
                                }
                            });
                        }
                        else if (e.deniedPresent.length > 0) { //权限被临时拒绝  
                            // 弹出提示框解释为何需要权限，可再次调用plus.android.requestPermissions申请权限  
                            uni.showModal({
                                title: '提示',
                                content: '请打开手机相机功能（点击确定后在权限中授权相机功能）',
                                // showCancel: false, // 不显示取消按钮
                                success(res) {
                                    if (res.confirm) {
                                        var Intent = plus.android.importClass("android.content.Intent");
                                        var Settings = plus.android.importClass(
                                            "android.provider.Settings");
                                        var Uri = plus.android.importClass("android.net.Uri");
                                        var mainActivity = plus.android.runtimeMainActivity();
                                        var intent = new Intent();
                                        intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                        var uri = Uri.fromParts("package", mainActivity.getPackageName(),
                                            null);
                                        intent.setData(uri);
                                        mainActivity.startActivity(intent);
                                    }
                                }
                            });
                        }else{
                            console.log('已有权限！');
                            return true
                        }
                    }, (e) => {
                        // console.log(e);
                        return true
                        console.log('Request Permissions error:' + JSON.stringify(e))
                    })
                }
            }