通常情况下我们是不会直接使用effect的,因为effect是一个底层的API,在我们使用Vue3的时候Vue默认会帮我们调用effect。effect翻译为作用,意思是使其发生作用,这个使其的其就是我们传入的函数,所以effect的作用就是让我们传入的函数发生作用,也就是执行这个函数。执行过程简图如下:接下来先通过例子了解effect的基本用法,然后再去了解原理。一、effect用法1、基本用法constobj=reactive({count:1})construnner=effect(()=
2023-05-10回答次数0访问次数1471
effect的基本实现exportletactiveEffect=undefined;//当前正在执行的effectclassReactiveEffect{active=true;deps=[];//收集effect中使用到的属性parent=undefined;constructor(publicfn){}run(){if(!this.active){//不是激活状态returnthis.fn();}try{this.parent=activeEffect;//当前的effect就是他的父亲a
2023-05-10回答次数0访问次数1210
Tether, Circle and other big stablecoin issuers will soon be on a tight leash in the European Union. With new rules that take effect on June 30, not only w...
2024-06-28回答次数访问次数917
Vue3.2版本引入了新的EffectscopeAPI,使用effectScope创建一个effect作用域,可以捕获其中所创建的响应式副作用(即计算属性和侦听器),这样捕获到的副作用可以一起处理。使用getCurrentScope返回当前活跃的effect作用域。使用onScopeDispose在当前活跃的effect作用域上注册一个处理回调函数。当相关的effect作用域停止时会调用这个回调函数。constscope=effectScope()scope.run(()=>{constd
2023-05-16回答次数0访问次数553
副作用函数副作用函数是指会产生副作用的函数,如下面的代码所示:functioneffect(){document.body.innerText='hellovue3'}当effect函数执行时,它会设置body的文本内容,但除了effect函数之外的任何函数都可以读取或设置body的文本内容。也就是说,effect函数的执行会直接或间接影响其他函数的执行,这时我们说effect函数产生了副作用。副作用很容易产生,例如一个函数修改了全局变量,这其实也是一个副作用。/
2023-05-11回答次数0访问次数653
首先,我们简单回顾一下:响应式系统的核心就是一个WeakMap---Map---Set的数据结构。WeakMap的key是原对象,value是响应式的Map。这样当对象销毁的时候,对应的Map也会销毁。Map的key就是对象的每个属性,value是依赖这个对象属性的effect函数的集合Set。然后用Proxy代理对象的get方法,收集依赖该对象属性的effect函数到对应key的Set中。还要代理对象的set方法,修改对象属性的时候调用所有该key的effect函数。上篇文章我们按照这样的思路
2023-05-15回答次数0访问次数1214
The EU's Markets in Crypto-Assets Regulation (MiCA) stablecoin rules are scheduled to take effect in just over one week.
2024-06-25回答次数访问次数395
The stablecoin firm is one of the first to comply with Europe's MiCA rules as they come into effect this summer.
2024-07-10回答次数访问次数836
The current market is intoxicated with utility coins due to their long-term vitality. This butterfly effect is increasingly causing cryptos like
2024-06-26回答次数访问次数223
Bitcoin philanthropy has emerged as a powerful social pressure, allowing people and businesses to assist charitable motives and have a fantastic effect on ...
2024-06-28回答次数访问次数775
Theworldofcryptocurrenciesisverydynamic.Pricescangoupordowninamatterofseconds.Thus,havingreliableanswerstosuchquestionsiscrucial
2024-06-15回答次数访问次数800
As the European Union's Markets in Crypto-Assets (MiCA) regulation comes into full effect, the cryptocurrency exchange Bitstamp that is set to be acquired ...
2024-06-27回答次数访问次数611
The introduction of cryptocurrency exchanges has increased drastically in the past two years. Naturally, this is the effect of the growing popularity of th...
2024-07-11回答次数访问次数565
Bitcoin miners have been actively selling their holdings since the halving effect kicked in. As the on-chain data suggests, the amount of selling pressure
2024-06-23回答次数访问次数478
Recently, a pseudonymous crypto expert, The Ripple Effect (@Ripple_Effect11), posed a question on X to the XRP community: “Would you sell #XRP if it spiked...
2024-07-16回答次数访问次数782
With new rules that take effect on June 30, not only will they require appropriate authorization to operate in the 27-nation trading bloc, they will also f...
2024-06-28回答次数访问次数872
watch的本质所谓的watch,其本质就是观测一个响应式数据,当数据发生变化时通知并执行相应的回调函数。实际上,watch的实现本质就是利用了effect和options.scheduler选项。如下例子所示://watch函数接收两个参数,source是响应式数据,cb是回调函数functionwatch(source,cb){effect(//触发读取操作,从而建立联系()=>source.foo,{scheduler(){//当数据变化时,调用回调函数cbcb()}})}如上面的代
2023-06-04回答次数0访问次数1610
With the Voyage 3D, ZTE presents a mid-range smartphone that sets itself apart from most of its competitors with its 3D display. The so-called "Neovision 3D Anytime Display" relies on eye tracking to enable a convincing 3D effect even when the d
2024-06-27回答次数访问次数438
WanttograbtheCardano$ADAairdropsusingDappRadarbutunsurewheretobegin?Fretnot,asthiswalkthroughwillexplaintheprocessthoroughly.
2024-06-16回答次数访问次数969
打开AE软件,进入其操作界面,在该界面内按键键盘上的Ctrl+I键,弹出import对话框,如图所示:在import对话框内找到我们需要的图片点击打开在project里就可以看到该图片了,如图所示:将该图片拖拽到composition窗口,在图片就显示出来了,如图所示:在上面的菜单里找到effect菜单,如图所示:点击effect菜单,在其内找到perspective选项,点击perspective选项,在其下拉菜单那里找到CCspotlight选项,点击该选项,其参数设置,如图所示:参数设置完
2024-04-28回答次数0访问次数583