code: function parseGruntCommandLine() {
          var cmdline = _cmdline.match(/--[\S]+\b/ig);
  
          if (null != cmdline) {
              for (var i = 0, n = cmdline.length; i < n; i++) {
                  // if cmdline does not have "=", set "true" as default value.
                  if (!cmdline[i].match(/=/i)) {
                      cmdline[i] += '=true';
                  }
              }
          } else {
              cmdline = [];
          }
  
          return cmdline;
      }
docs: check command line Judge the grunt command line.
  if the command line includes "--*", call set to the grunt command line.