nodejs 按行读取 readline

 1 //普通读取方法
 2 // var data = fs.readFileSync(versionpath,'utf8');
 3     // var dataarr = data.split('\n');
 4     // dataarr.forEach(function(dataarr) {
 5     //     if( dataarr.indexOf('version') > -1) {
 6     //         version =  (dataarr.split(':')[1]).match(/\"(.*)\"/)[1];
 7     //         return;
 8     //     }
 9     // })
 //按行读取
      // 创建写入临时文件夹
     if(!fs.existsSync('./yotmp')){
         fs.mkdirSync('./yotmp');
     }
     // tmpPath = './yotmp/version.scss';
     // fs.writeFileSync(tmpPath, '');
     var file = fs.createReadStream(versionpath);
     var out = fs.createWriteStream('./yotmp/varialbes.scss');
     log(out);
     var rl = readline.createInterface({
         input: file,
         output: out
     });
     rl.on('line', function (line){
         log('line:' + line);
         if( line.indexOf('version') > -1) {
             version =  (line.split(':')[1]).match(/\"(.*)\"/)[1];
             fsUtil.rmDirSync('./yotmp');
             log("///////////////");
             rl.close();
             return;
         }
     });