uni-app判斷有無通知權限，並進行設置

onLoad() {
    /* 獲取當前手機是否有通知權限 */
	// #ifdef APP-PLUS
	    let main = plus.android.runtimeMainActivity();
		let pkName = main.getPackageName();
		let NotificationManagerCompat = plus.android.importClass("android.support.v4.app.NotificationManagerCompat");  
		let packageNames = NotificationManagerCompat.from(main);  
		if (!packageNames.areNotificationsEnabled()) {//手機沒有開啓通知的權限
		    let uid = main.getApplicationInfo().plusGetAttribute("uid");
			let Intent = plus.android.importClass('android.content.Intent');
			let Build = plus.android.importClass("android.os.Build");
			//android 8.0引導  
			if (Build.VERSION.SDK_INT >= 26) {
			    let intent = new Intent('android.settings.APP_NOTIFICATION_SETTINGS');
			　　intent.putExtra('android.provider.extra.APP_PACKAGE', pkName);
			} else if (Build.VERSION.SDK_INT >= 21) { //android 5.0-7.0  
			　　let intent = new Intent('android.settings.APP_NOTIFICATION_SETTINGS');
			　　intent.putExtra("app_package", pkName);
			　　intent.putExtra("app_uid", uid);
			} else { //(<21)其他--跳轉到該應用管理的詳情頁
			　　let Settings = plus.android.importClass("android.provider.Settings");
			　　let Uri = plus.android.importClass("android.net.Uri");
			　　let intent = new Intent();
			　　intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
			　　let uri = Uri.fromParts("package", main.getPackageName(), null);
			　　intent.setData(uri);
			}
			// 跳轉到該應用的系統通知設置頁  
			main.startActivity(intent);
		}
		// #endif 
		/* 獲取當前手機是否有通知權限 */
}