node.js学习之异常初步

还是上一篇博文的情景，如果用户输入的不是localhost:3000/login怎么办，此时就需要捕获异常

n9_exception.js

var http =  require('http');                                        
var url = require('url');        
var router = require('./models/router');    
var exception = require('./models/Exception');
http.createServer(function  (request,response){                                        
    if(request.url!=="/favicon.ico"){              //清除第2此访问                
    pathname=url.parse(request.url).pathname;        
    pathname = pathname.replace(/\//,'');//替换掉前面的/        
    try{        
      router[pathname](request,response);    
      /* data  =  exception.expfun(0);
      response.write(data);
      response.end(''); */
    }catch(err){        
      console.log('aaaaa='+err);    
      response.writeHead(200,{'Content-Type':'text/html;charset=utf-8'}); 
      //向页面输出错误信息
      response.write(err.toString());        
      response.end('');
    }
    console.log("server执行完毕");
                                                                                        }                                        
}).listen(3000);                                        
console.log('Server running at http://127.0.0.1:3000/');

./models/Exceptiom.js

module.exports={      
    expfun:function(flag){      
        if(flag==0){      
            throw  '我是例外';      
        }      
        return  "success";      
    }      
}

当用户访问的不是login页面时运行结果：