objective-c - iOS webview loadDataInterface

Question

On iOS, webview loads through loadData to enter the first-level page, and then enters the second-level page. When returning, calling the [_webview goBack] method cannot return to the first-level page. However, when loading through loadRequest, you can use the [_webview goBack] method.
The question is: how to return to the first-level page after using the loadData method.