The simplest thing is to use ps.

1, enter the text to be displayed, and then make an understatement or shadow stroke of your choice.

2. Create a new layer on top of the question and draw a diagonal line on the leftmost side of the layer with a brush.

3. Bring up the dynamic column (ps cs5), then copy the first one and move the line of the layer to the far right.

4. Create clipping masks for the first frame and the second frame respectively.

5. Click the "oooooo" graphic at the bottom of the dynamic bar and select the frame 15 to finish.