texBase::init(), texBase::pend(),执行效果请查看html源码
1+2=3 : demo for `texBase::myfunc(1,2)`
1+2=3 : demo for `tex('texBase')->ufunc(1,2)`
3*4=12 : demo for `texDemo::ufunc(3,4)`
3*4=12 : demo for `tex('texDemo')->ufunc(3,4)`