blocks|key|1452537|text|您需要使用定义要添加到HTMLElement的额外函数的原始接口，添加一个定义为merged的定义|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1452538|interface+HTMLElement+{
++++fadeOut(duration:+number):+Promise<void>
}

//+Will+now+work+
HTMLElement.prototype.fadeOut+=+function+(duration:+number+=+300):+Promise<void>+{
++++const+keyframes:+AnimationKeyFrame[]+=+[{+opacity:+1+},+{+opacity:+0+}];
++++return+new+Promise(resolve+=>+{
++++++++const+animation:+Animation+=+this.animate(keyframes,+duration);
++++++++animation.onfinish+=+()+=>+resolve();
++++});
};|code-block|syntax|javascript|1452539|如果代码位于模块中，则需要在全局命名空间中声明该接口|1452540|declare+global+{
++++interface+HTMLElement+{
++++++++fadeOut(duration:+number):+Promise<void>
++++}

}
HTMLElement.prototype.fadeOut+=+function+(duration:+number+=+300):+Promise<void>+{
++++const+keyframes:+AnimationKeyFrame[]+=+[{+opacity:+1+},+{+opacity:+0+}];
++++return+new+Promise(resolve+=>+{
++++++++const+animation:+Animation+=+this.animate(keyframes,+duration);
++++++++animation.onfinish+=+()+=>+resolve();
++++});
};


export+var+x;|1452541|entityMap|0|LINK|mutability|MUTABLE|url|https://www.typescriptlang.org/docs/handbook/declaration-merging.html^0|B|B|14|6|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

<p>You need to add a definition to be <a href="https://www.typescriptlang.org/docs/handbook/declaration-merging.html" rel="noreferrer">merged</a> with the original interface in which you define the extra function to be added to <code>HTMLElement</code></p>

<pre><code>interface HTMLElement {
    fadeOut(duration: number): Promise&lt;void&gt;
}

// Will now work 
HTMLElement.prototype.fadeOut = function (duration: number = 300): Promise&lt;void&gt; {
    const keyframes: AnimationKeyFrame[] = [{ opacity: 1 }, { opacity: 0 }];
    return new Promise(resolve =&gt; {
        const animation: Animation = this.animate(keyframes, duration);
        animation.onfinish = () =&gt; resolve();
    });
};
</code></pre>

<p>If the code is in a module you need to declare the interface in the global namespace </p>

<pre><code>declare global {
    interface HTMLElement {
        fadeOut(duration: number): Promise&lt;void&gt;
    }

}
HTMLElement.prototype.fadeOut = function (duration: number = 300): Promise&lt;void&gt; {
    const keyframes: AnimationKeyFrame[] = [{ opacity: 1 }, { opacity: 0 }];
    return new Promise(resolve =&gt; {
        const animation: Animation = this.animate(keyframes, duration);
        animation.onfinish = () =&gt; resolve();
    });
};


export var x;
</code></pre>


<p>I'm trying to extend the prototype of the HTMLElement object in <code>main.ts</code>, so that I can use it throughout my whole Angular 6 project.</p>

<p>But I get the <code>Property 'fadeOut' does not exist on type 'HTMLElement'</code>.</p>

<pre><code>HTMLElement.prototype.fadeOut = function(duration: number = 300): Promise&lt;void&gt; {
  const keyframes: AnimationKeyFrame[] = [{ opacity: 1 }, { opacity: 0 }];
  return new Promise(resolve =&gt; {
    const animation: Animation = this.animate(keyframes, duration);
    animation.onfinish = () =&gt; resolve();
  });
};
</code></pre>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const circle = document.getElementById('circle');

HTMLElement.prototype.fadeOut = function(duration = 300) {
  const keyframes = [{ opacity: 1 }, { opacity: 0 }];
  return this.animate(keyframes, duration).finished
};

circle.fadeOut(2000);</code></pre>
<pre class="snippet-code-css lang-css prettyprint-override"><code>#circle {
  height: 100px;
  width: 100px;
  margin: 50px;
  border-radius: 50%;
  background-color: #0f477f;
 }
 </code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="circle"&gt;&lt;/&gt;</code></pre>
</div>
</div>
</p>

<p>What am I doing wrong?</p>

<p>Where do I need to put this code so that can I make this method available everywhere?</p>

<p>Do you also see a possibility to make this code cleaner?</p>


Extend HTMLElement prototype

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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我正在尝试用main.ts扩展HTMLElement对象的原型，这样我就可以在我的整个Angular 6项目中使用它。但我得到了Property 'fadeOut' does not exist on type 'HTMLElement'。HTMLElement.prototype.fadeOut = function...

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