function getCommandLine() {
   switch (process.platform) { 
      case 'darwin' : return 'open';
      case 'win32' : return 'start';
      case 'win64' : return 'start';
      default : return 'xdg-open';
   }
}

第二步,执行命令行,然后执行路径

var sys = require('sys');
var exec = require('child_process').exec;

exec(getCommandLine() + ' ' + filePath);