JS：
onLoad: function () {
this.label.string = this.text;
cc.log("====111");
var customClass = cc.CustomClass.create();
customClass.callback = function(i, j){
//this.label.string = "callback";
cc.log("customClass.callback: " + i + j);
};
var msg = customClass.helloMsg()
//this.label.string = msg
cc.log("customClass's msg is ===: " + msg)
},
C++:
std::string CustomClass::helloMsg() {
js_proxy_t * p = jsb_get_native_proxy(this);
//jsval retval;
JSContext* jc = ScriptingCore::getInstance()->getGlobalContext();
// 定义参数，由两个参数
jsval v[] = {
v[0] = int32_to_jsval(jc, 32),
v[1] =UINT_TO_JSVAL(88)
};
// 通过 ScriptingCore 封装好的方法实现回调，可以帮助我们节省很多细节上的研究
ScriptingCore::getInstance()->executeFunctionWithOwner(OBJECT_TO_JSVAL(p->obj), "callback", 2, v);
CCLOG("===IN HELLO MSG");
return "Hello from CustomClass::sayHello";
}
