var http = require("http"); var server = http.createServer(function(req,res){
      var userurl = req.url;     res.writeHead(200,{"Content-Type":"text/html;charset=UTF-8"}); //substr函数来判断此时的开头     if(userurl.substr(0,9)=="/student/"){
          var studentid = userurl.substr(9);         console.log(studentid);         if(/\d{10}/.test(studentid)){
              res.end("你要查询学生信息，id为"+studentid);         }else{
              res.end("你要查询学生信息学号位数不对");         }     }else if(userurl.substr(0,9)=="/teacher/"){
          var teacherid = userurl.substr(9);         if(/\d{6}/.test(teacherid )){
              res.end("你要查询老师信息，id为"+teacherid );         }else{
              res.end("你要查询老师信息学号位数不对");         }     }     }); server.listen(3000,"127.0.0.1");