M.net.ftp.download('host', {
    port : '21',
    account : {
        username : 'anonymous',
        password : '',
    },
    target : {
        localpath : 'localpath',
        serverfiles : [ 'server_file0', 'server_file1', ],
    },
    finish : function(resultCode, resultMessage, setting) {
        if (resultCode == 'SUCCESS') {
            // TODO : success handle code here 
        } else {
            // TODO : fail handle code here 
        }
    }
});