增加withType参数

[lishengguo]

增加withType参数，控制hessian是否返回{$class:'',$:{}}，

[omnip620]

感谢提供新特性，不过有点不太明白这个参数的意义，能否稍微详细说明下，以及参数有哪些可选值，🙏。

[lishengguo]

withType是hessian返回的对像是否带类型，默认为false，为true时返回值形式如：{$class:'java.lang.Long',$:100}。
opt.withType改成opt.returnWithType更好理解点， 是吧。

[xiaojinhe2]

Hello,
I would like to ask node-zookeeper-dubbo this module how to use it, I always use TypeError: Cannot read property 'buildUserAgentTree' of undefined can not find the method, in fact, this service interface exists, I use telnet to log in dubbo When you can view the interface information of the service through ls, the following is my call code, trouble to help look down

var nzd = require('node-zookeeper-dubbo');

const opt = {
application:{ name:'parkhelper-service' },
registry:'127.0.0.1:2182',
dubboVer:'2.6.1',
group:'cn.parkhelper',
root:'dubbo',
dependencies:{
AgentService:{
interface:'cn.parkhelper.service.park.AgentService',
version:'1.0-SNAPSHOT',
group:'cn.parkhelper',
timeout:5000
}
}
};

const Dubbo = new nzd(opt);

var arg1 = {$class:'java.lang.String',$:'8a04a41f59305d810159639b42ae000d'};
Dubbo.AgentService.buildUserAgentTree(arg1).then(function(data){ //error message is here
console.log(data);
}).catch(function(err){
console.log(err);
})