使用emscripten embind在c ++中调用javascript函数

This question comes in two parts. What I want to do is to put most of my program logic in c++ classes and some view related function in js (like DOM manipulation and styling.) I use emscripten embind the classes and it works fine while I don't know how to interact with hte js code (there are really limited resources on their tutorial.)This question comes in two parts. What I want t