一份代码里的：

var   _         = require('underscore'),                  // 这种变量命名到底是是啥意思？
       Promise   = require("node-promise").Promise,
       when      = require("node-promise").when,           //在node里找不到这个when 啊？


  ……

    // execute the command
        when(canExecute, function (canExecute){
            if(canExecute){
                when(that.genericCommand(cmd), function (result) {
                        promise.resolve(result);
                    }, function (error) {
                        promise.resolve(DriverResponse.Failure(Status.State.ERROR, DriverResponse.Errors.BAD_STATE));
                    }
                );
            } else {
                promise.resolve(DriverResponse.Failure(Status.State.ERROR, DriverResponse.Errors.BAD_STATE));
            }
        });
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FROM 106.39.16.*