node.js中的path.normalize方法使用说明
方法说明:
输出规范格式的path字符串。
语法:
path.normalize(p)
由于该方法属于path模块,使用前需要引入path模块(varpath=require(“path”))
例子:
path.normalize('/foo/bar//baz/asdf/quux/..')
//returns
'/foo/bar/baz/asdf'
源码:
//windowsversion
 exports.normalize=function(path){
   varresult=splitDeviceRe.exec(path),
       device=result[1]||'',
       isUnc=device&&device.charAt(1)!==':',
       isAbsolute=exports.isAbsolute(path),
       tail=result[3],
       trailingSlash=/[\\\/]$/.test(tail);
 
   //Ifdeviceisadriveletter,we'llnormalizetolowercase.
   if(device&&device.charAt(1)===':'){
     device=device[0].toLowerCase()+device.substr(1);
   }
 
   //Normalizethetailpath
   tail=normalizeArray(tail.split(/[\\\/]+/).filter(function(p){
     return!!p;
   }),!isAbsolute).join('\\');
 
   if(!tail&&!isAbsolute){
     tail='.';
   }
   if(tail&&trailingSlash){
     tail+='\\';
   }
 
   //Convertslashestobackslasheswhen`device`pointstoanUNCroot.
   //Alsosquashmultipleslashesintoasingleonewhereappropriate.
   if(isUnc){
     device=normalizeUNCRoot(device);
   }
 
   returndevice+(isAbsolute?'\\':'')+tail;
 };