从Web浏览器获取位置

I am just a Nodejs newbie. I'm having a small simple project. It's call map-chat. This is 2 main files of my project core.js and app.js I want when create user, my app will get location from the web browser and the icon of each user will point on it. Pls help me.I am just a Nodejs newbie. I'm having a small s