Merge pull request #1 from HADB/master

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Merge pull request #2 from HADB/master

merge from HADB:master
Merge pull request #3 from HADB/master

优化了一些动画效果，尝试修复擦除的bug
Merge pull request #4 from HADB/master

圣诞游戏第二次上线
index.js中的绝对路径改为相对路径
Merge pull request #6 from rexsunces/master

index.js中的绝对路径改为相对路径
tj
Merge pull request #7 from rexsunces/master

换回绝对路径，使github.io上的示例能工作
返回按钮url fix
Merge branch 'master' into gh-pages