共计 983 个字符,预计需要花费 3 分钟才能阅读完成。
var data = {
name: "fangtangxiansheng",
job: "fe",
power: 0
};
console.log(data);
let target = null;
class willObserver {watchList = [];
// 减少观察者
addWatch() {target && (this.watchList =[... new Set([...this.watchList, target])]);
}
watchUpdate() {this.watchList.forEach((watch) => {watch.update();
});
}
// 告诉
notiy() {this.watchUpdate();
}
}
class Watch {constructor(cb) {
this.cb = cb;
target = this;
}
update() {this.cb();
}
}
const creatWatch = (expCondition, cb) => {new Watch(cb);
expCondition();};
// 结构”数据依赖埋点“const trasnfromDataToAutoListion = (data) => {Object.keys(data).forEach((key) => {let cache = data[key];
let _ob = new willObserver();
Object.defineProperty(data, key, {
// 做一下埋点
set(v) {
cache = v;
_ob.notiy();},
// 触发 watch 实例更新
get() {_ob.addWatch();
return cache;
}
});
});
};
trasnfromDataToAutoListion(data);
creatWatch(() => {console.log("condition", data.name, data.job);
},
() => {document.querySelector("#html").innerHTML = JSON.stringify(data);
}
);
document.querySelector("#html").innerHTML = JSON.stringify(data);
setInterval(() => {data.power = `${Math.random() * 100}%`;
}, 500);
demo
正文完