Function update

packages/core/src/factory/context.js:251–266

(handle, init)

        });
    },
    update(handle, init) {
        extend(this, {
            deleted: false,
            $handle: handle,
            $render: handle.$render,
            $api: handle.api,
            vm: handle.vm,
            vNode: handle.$render.vNode,
            updated: false,
            cacheValue: this.rule.value
        });
        !init && this.unwatch();
        this.watchTo();
        this.link();
        this.updateType();
    }
})