javascript console 增加时间戳

function getDate(extra){  
 var dat = new Date;//生成日期  
 var year = dat.getFullYear();//取得年  
 var month = dat.getMonth()+1;    //取得月,js从0开始取,所以+1  
 var date1 = dat.getDate(); //取得天  
 var hour = dat.getHours();//取得小时  
 var minutes = dat.getMinutes();//取得分钟  
 var second = dat.getSeconds();//取得秒  
 var haomiao = dat.getMilliseconds();  
 dat = undefined;  
 return year+"-"+month+"-"+date1+" "+hour+":"+minutes +":"+second+" "+haomiao + extra ;  
}  
  
console.oldlog = console.log;  
console.oldtrace = console.trace;  
console.olddebug = console.debug;  
console.oldinfo = console.info;  
console.oldwarn = console.warn;  
console.olderror = console.error;  
  
  
function log(){  
 process.stdout.write(getDate('-log-: '));  
 console.oldlog.apply(console, arguments);  
}  
  
function trace(){  
 process.stdout.write(getDate('-trace-: '));  
 console.oldtrace.apply(console, arguments);  
}  
  
function info(){  
 process.stdout.write(getDate('-info-: '));  
 console.oldinfo.apply(console, arguments);  
}  
  
function warn(){  
 process.stdout.write(getDate('-warn-: '));  
 console.oldwarn.apply(console, arguments);  
}  
  
function error(){  
 process.stderr.write(getDate('-error-: '));  
 console.olderror.apply(console, arguments);  
}  
  
function debug(){  
 process.stdout.write(getDate('-debug-: '));  
 console.olddebug.apply(console, arguments);  
}  
  
console.log = log;  
console.debug = debug;  
console.trace = trace;  
console.info = info;  
console.warn = warn;  
console.error = error;  
  
global.log = log;  
global.debug = debug;  
global.trace = trace;  
global.info = info;  
global.warn = warn;  
global.error = error;  
  
module.exports = global;