跨年烟花代码canvas id cas style background color rgba05241浏览器不支持canvas canvas div class city img src img city.png alt div img src img moon.png alt id moon style visibility hidden div style display none div class shape兔年吉祥div div class shape突飞猛进div div class shape阖家幸福div div class shape万事如意div div class shape心想事成div div