Node.js中所用的fs.renameSync出错：Error: EXDEV, cross-device link no

Win7下，折腾Node.js过程中，运行服务器，其中内部调用相关代码： function show(response) {   console.log("Request handler 'show' was called.");   fs.readFile("/tmp/test.png", "binary", function(error, file)   {     if(error) {       response.writeHead(500, {"Content-Type": "text/plain"});       response.write(error + "\n");       response.end();     } else {       response.writeHead(200, {"Content-Type": "image/png"});       response.write(file, "binary");       response.end();     }   }); } 去重命名，结果出错： D:\tmp\tmp_dev_root\ […]