Specific methods
1. We use the data cable to connect the ipad with the computer.
2. Then check to see if itunes has been authorized to this computer, if not authorized we can be authorized according to the following method, or skip.
1 We click "Store" on the left side of itunes and select "Authorize for this computer" in the Drop-down menu box.
2 and then enter your Apple ID username password for authorization.
3. Now we have the "edit"-"preferences"-"parents" in itunes, then tick "Disable-itunes store" and check "Allow itunes U", then click OK. Clicking on the itunes Store in itunes automatically jumps to itunes U, which is why we set it up.
4. Choose your ipad, click "Sync" for a sync
5. At the top of itunes menu bar, find "edit", in the Drop-down menu box, select "Preferences" in the pop-up window, find "parents", then uncheck the "Disable-itunes store", and then click OK.
6. After forced synchronization, the app store can be opened successfully on the ipad.
Small Tips
If you don't have a network, you may not be able to connect to the App Store.