我有一个类似的问题,但不一样。这个关注于新的ES6类关键字以及如何处理它。 SignalR正在调用类方法。当进入那个类的方法时,这个'指的是SignalR集线器而不是类实例本身。如何在SignalR使用新的ES6类调用的类成员中获取类实例?
class gameLoad {
constructor(){
}
init(){
// create the network object and hook it's functions update for loading
this.network = $.connection.testHub;
this.network.client.hello = this.sayHello;
}
// this is called from signalR and 'this' now refers to the signalR hub inside this function. how can I get the class instance?
sayHello(){
console.log(this); // 'this' refers to signalR object not gameLoad object
}
create(){
var self = this;
$.connection.hub.start().done(function () {
console.log("Started!")
console.log("Calling server function.");
// make our first network call which will turn around and call client.hello which is bound to this classes sayHello() member function
self.network.server.hello();
});
}
}
答案 0 :(得分:1)
使用类时,最好使用箭头功能,以便正确设置“此”。
在您的示例中,您将sayHello分配给客户端的hello方法。那时你需要将gameLoad绑定到它:
this.network.client.hello = this.sayHello.bind(gameLoad);
或者,您可以将sayHello转换为箭头函数:
sayHello = () => {