Function watchRef

tech-study.js:1280–1286

(source, callback)

 * @returns
 */
const watchRef = (source, callback) => {
    // 收集依赖
    const effectRes = shallowRef(callback());
    // 监听
    watch(source, () => (effectRes.value = unref(callback())));
    return effectRes;
};
/**
 * @description 监听影响 ref
 * @param refVal