h5键盘的的一些坑

参考资料：

https://www.cnblogs.com/hefenghefeng/p/7003152.html?utm_source=itdadao&utm_medium=referral

https://www.jianshu.com/p/9fb6eeefcb06

https://www.jianshu.com/p/1a7a72278041?utm_campaign

https://www.cnblogs.com/yexiaochai/p/3561939.html