推送打印内容

调用方式: HTTP POST method: wemili.push

返回结果:JSON字符串

----------服务器返回的结果有如下几种：----------

{"responseCode":0,"msg":"服务器接收订单成功","orderindex":"xxxxxxxxxxxxxxxxxx"}
{"responseCode":1,"msg":"打印机编号错误"}
{"responseCode":2,"msg":"服务器处理订单失败"}
{"responseCode":3,"msg":"打印内容太长"}
{"responseCode":4,"msg":"请求参数错误"}