Method constructor

tech-study.js:942–973

(val, shallow = false)

    _value;
    value;
    constructor(val, shallow = false) {
        const _this = this;
        this._isShallow = shallow;
        if (val && typeof val === 'object' && shallow) {
            const reactiveVal = reactive(val);
            this._value = reactiveVal;
            this.value = reactiveVal;
        }
        else {
            this._value = val;
            this.value = val;
        }
        // 定义属性
        Object.defineProperty(this, 'value', {
            get() {
                // 收集依赖
                trackRef(this);
                return _this._value;
            },
            set(newVal) {
                // 旧数据
                const oldVal = this._value;
                // 数据变化
                if (oldVal !== newVal) {
                    // 设置新数据值
                    _this._value = newVal;
                    // 通知依赖
                    triggerRef(this, newVal, oldVal);
                }
            },
        });
    }
    toJSON() {
        return this._value;
    }