Method bind

packages/fairygui/src/binding/PropertyBinding.ts:287–299

* Bind a property to an object's field * 将属性绑定到对象的字段

(
        source: IObservableProperty<T[K]>,
        target: T,
        key: K
    )

     * 将属性绑定到对象的字段
     */
    public bind<T, K extends keyof T>(
        source: IObservableProperty<T[K]>,
        target: T,
        key: K
    ): this {
        target[key] = source.value;
        this._subscriptions.push(
            source.subscribe((newValue) => {
                target[key] = newValue;
            })
        );
        return this;
    }

    /**
     * Two-way bind between properties