塘厦镇住房规划建设局网站,网站一定要备案吗,godaddy上传网站,怎么完整下载网站模板原型在JavaScript中虽不常被提及#xff0c;却是构建大型应用和框架不可或缺的基础概念。它在我们的日常编码中无处不在#xff0c;如React和Vue的代码仓库中#xff0c;原型的使用频率高达数百次。即便是在看似简单的代码片段中#xff0c;如class Foo extends React.Comp…原型在JavaScript中虽不常被提及却是构建大型应用和框架不可或缺的基础概念。它在我们的日常编码中无处不在如React和Vue的代码仓库中原型的使用频率高达数百次。即便是在看似简单的代码片段中如class Foo extends React.Component或是在访问原型方法时如bar.hasOwnProperty(xxx)和bar.toString都蕴含着原型的深刻应用。若你对原型仍感迷茫那么现在正是深入理解它的好时机。本文将带你探索原型的奥秘并进一步介绍原型链的概念。◆ 原型的重要性原型是构建大型应用和框架的基础概念广泛应用于如React和Vue等库中。通过对原型的理解可以更好地进行日常编码。◆ 原型对象解析每个函数声明都会生成一个prototype属性指向原型对象该对象包含constructor属性和__proto__属性。在JavaScript中每当声明一个函数时都会伴随这样一个原型对象。这个原型对象包含一个constructor属性它指向Foo函数本身。此外原型对象还拥有一个__proto__属性但在此我们暂时不深入探讨。上图左侧展示了一个名为Foo的函数它拥有一个名为prototype的属性该属性指向右侧的原型对象。在JavaScript中每个对象都有一个名为\_\_proto\_\_的属性它默认指向该对象所对应构造函数的原型对象。这个\_\_proto\_\_属性正如我们之前所探讨的它确实扮演着指向构造函数原型的重要角色。◆ 实例化过程使用new操作符创建对象时该对象的__proto__属性指向构造函数的原型。使用new操作符我们创建了一个foo对象。此时我们可以观察到的图解变化如下在创建了foo对象之后尽管我们并未向其添加任何方法但仍然能够调用如toString()和hasOwnProperty()等方法。这背后的原理是什么呢◆ 原型链的核心概念原型链实现JavaScript的继承机制通过链条连接对象的原型从而实现方法查找与调用。通过前面的分析我们可以清晰地看到当使用const foo new Foo()语句时实际上在背后形成了一个链条。这个链条连接了各个对象的原型从而实现了继承关系。我们来到了原型的核心概念——原型链。上图中Foo.prototype.__proto__指向了Object.prototype这表明每个函数的原型都是Object的实例。这就像每个函数的原型都是通过new Object()创建的一样。继续深入探讨当使用const foo new Foo()语句时实际上在背后形成了一个链条。这个链条连接了各个对象的原型从而实现了继承关系。当我们尝试访问foo对象上的某个方法时JavaScript会沿着原型链进行查找。从图示的链条中可以看出如果foo对象自身没有某个方法那么JavaScript会沿着其原型即foo.__proto__进行查找。如果原型对象中仍然没有找到该方法那么就会继续沿着该原型的原型即foo.__proto__.__proto__进行查找以此类推。这个过程会一直持续到找到对应的方法或者到达原型链的顶端即null。因此当我们尝试调用foo对象上的toString()方法时JavaScript会先在foo对象自身查找如果没有找到就会沿着原型链逐级向上查找直到在Object的原型上找到为止。这就是为什么我们在foo对象上能够调用Object的原型方法的原因。https://gitee.com/aCgiJr419299425265/yzsiluxffg/issues/IEGEKChttps://gitee.com/aCgiJr419299425265/yzsiluxffg/issues/IEGEFLhttps://gitee.com/aqHamD219248463431/gzdhvyshnv/issues/IEGEBEhttps://gitee.com/aqHamD219248463431/gzdhvyshnv/issues/IEGE7Lhttps://gitee.com/aqHamD219248463431/gzdhvyshnv/issues/IEGE3Ohttps://gitee.com/aqHamD219248463431/gzdhvyshnv/issues/IEGDZZhttps://gitee.com/aqHamD219248463431/gzdhvyshnv/issues/IEGDWChttps://gitee.com/aSIDET919239422381/ntmplndmrn/issues/IEGDRShttps://gitee.com/aSIDET919239422381/ntmplndmrn/issues/IEGDO0https://gitee.com/aSIDET919239422381/ntmplndmrn/issues/IEGDJQhttps://gitee.com/aSIDET919239422381/ntmplndmrn/issues/IEGDF7https://gitee.com/aSIDET919239422381/ntmplndmrn/issues/IEGD96https://gitee.com/atUefc619248464183/rzinrmfnzc/issues/IEGD4Fhttps://gitee.com/atUefc619248464183/rzinrmfnzc/issues/IEGD09https://gitee.com/atUefc619248464183/rzinrmfnzc/issues/IEGCW9https://gitee.com/atUefc619248464183/rzinrmfnzc/issues/IEGCQLhttps://gitee.com/atUefc619248464183/rzinrmfnzc/issues/IEGCIWhttps://gitee.com/aYeCJo619209425792/kdqguwzcgp/issues/IEGC8Shttps://gitee.com/aYeCJo619209425792/kdqguwzcgp/issues/IEGC28https://gitee.com/aYeCJo619209425792/kdqguwzcgp/issues/IEGBWJhttps://gitee.com/aYeCJo619209425792/kdqguwzcgp/issues/IEGBQRhttps://gitee.com/aYeCJo619209425792/kdqguwzcgp/issues/IEGBLIhttps://gitee.com/amextm819249322447/fsdfbxgjph/issues/IEGBEHhttps://gitee.com/amextm819249322447/fsdfbxgjph/issues/IEGB99https://gitee.com/amextm819249322447/fsdfbxgjph/issues/IEGB3Chttps://gitee.com/amextm819249322447/fsdfbxgjph/issues/IEGAXQhttps://gitee.com/amextm819249322447/fsdfbxgjph/issues/IEGASDhttps://gitee.com/acaJqD119219327416/bwqfiklnxg/issues/IEGALGhttps://gitee.com/acaJqD119219327416/bwqfiklnxg/issues/IEGABLhttps://gitee.com/acaJqD119219327416/bwqfiklnxg/issues/IEGA6Thttps://gitee.com/acaJqD119219327416/bwqfiklnxg/issues/IEGA23https://gitee.com/acaJqD119219327416/bwqfiklnxg/issues/IEG9XChttps://gitee.com/azCGPZ219209428970/fjakswrgwz/issues/IEG9RQhttps://gitee.com/azCGPZ219209428970/fjakswrgwz/issues/IEG9N6https://gitee.com/azCGPZ219209428970/fjakswrgwz/issues/IEG9I9https://gitee.com/azCGPZ219209428970/fjakswrgwz/issues/IEG9EIhttps://gitee.com/azCGPZ219209428970/fjakswrgwz/issues/IEG9AFhttps://gitee.com/avHqus619299426334/yypggqulos/issues/IEG95Uhttps://gitee.com/avHqus619299426334/yypggqulos/issues/IEG91Vhttps://gitee.com/avHqus619299426334/yypggqulos/issues/IEG8XPhttps://gitee.com/avHqus619299426334/yypggqulos/issues/IEG8TJhttps://gitee.com/avHqus619299426334/yypggqulos/issues/IEG8PLhttps://gitee.com/aoekLC919209427213/xclolcysyj/issues/IEG8KUhttps://gitee.com/aoekLC919209427213/xclolcysyj/issues/IEG8FYhttps://gitee.com/aoekLC919209427213/xclolcysyj/issues/IEG8BUhttps://gitee.com/aoekLC919209427213/xclolcysyj/issues/IEG884https://gitee.com/aoekLC919209427213/xclolcysyj/issues/IEG83Ehttps://gitee.com/aIFxNH819209426944/plkhnleavh/issues/IEG7ZEhttps://gitee.com/aIFxNH819209426944/plkhnleavh/issues/IEG7VZhttps://gitee.com/aIFxNH819209426944/plkhnleavh/issues/IEG7SGhttps://gitee.com/aIFxNH819209426944/plkhnleavh/issues/IEG7OFhttps://gitee.com/aIFxNH819209426944/plkhnleavh/issues/IEG7JLhttps://gitee.com/axSTJD619249320312/ezrgplteby/issues/IEG7F2https://gitee.com/axSTJD619249320312/ezrgplteby/issues/IEG7BKhttps://gitee.com/axSTJD619249320312/ezrgplteby/issues/IEG77Xhttps://gitee.com/axSTJD619249320312/ezrgplteby/issues/IEG74Xhttps://gitee.com/axSTJD619249320312/ezrgplteby/issues/IEG71Vhttps://gitee.com/aqnZRH519289620240/ygnlverovc/issues/IEG6Y8https://gitee.com/aqnZRH519289620240/ygnlverovc/issues/IEG6V9https://gitee.com/aqnZRH519289620240/ygnlverovc/issues/IEG6S9https://gitee.com/aqnZRH519289620240/ygnlverovc/issues/IEG6P4https://gitee.com/aqnZRH519289620240/ygnlverovc/issues/IEG6LLhttps://gitee.com/aKTPhu219299426706/ewaruydusw/issues/IEG6G9https://gitee.com/aKTPhu219299426706/ewaruydusw/issues/IEG6BZhttps://gitee.com/aKTPhu219299426706/ewaruydusw/issues/IEG67Lhttps://gitee.com/aKTPhu219299426706/ewaruydusw/issues/IEG63Bhttps://gitee.com/aKTPhu219299426706/ewaruydusw/issues/IEG5Y4https://gitee.com/aHPkAO319229336914/tmgibbybtk/issues/IEG5TBhttps://gitee.com/aHPkAO319229336914/tmgibbybtk/issues/IEG5PDhttps://gitee.com/aHPkAO319229336914/tmgibbybtk/issues/IEG5KYhttps://gitee.com/aHPkAO319229336914/tmgibbybtk/issues/IEG5GKhttps://gitee.com/aHPkAO319229336914/tmgibbybtk/issues/IEG5CEhttps://gitee.com/aURJnm219259423981/vdjjcldiut/issues/IEG56Yhttps://gitee.com/aURJnm219259423981/vdjjcldiut/issues/IEG52Phttps://gitee.com/aURJnm219259423981/vdjjcldiut/issues/IEG4YKhttps://gitee.com/aURJnm219259423981/vdjjcldiut/issues/IEG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