I have waste all day trying to find out why my button don't work on my mobile device. It's not because I have another div or something, I try to blank project, just to test the button, but not work again, it's totally because the version of phaser, only when I change my phaser.min.js to 2.3.0, it works fine. It's late at my country, but I still want to tell everyone, hope you guy can save a beautiful day!!! And I hope the Phaser can fix this problem in the next version!