56 lines
1.6 KiB
Markdown
56 lines
1.6 KiB
Markdown
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---
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id: 587d7db2367417b2b2512b8b
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title: Understand the Immediately Invoked Function Expression (IIFE)
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challengeType: 1
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videoUrl: ''
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localeTitle: 理解立即调用的函数表达式（IIFE）
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---
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## Description
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<section id="description"> JavaScript中的一个常见模式是在声明函数后立即执行： <blockquote> （function（）{ <br> console.log（“Chirp，chirp！”）; <br> }）（）; //这是一个立即执行的匿名函数表达式<br> //输出“Chirp，chirp！”立即</blockquote>请注意，该函数没有名称，也没有存储在变量中。函数表达式末尾的两个括号（）会立即执行或调用它。此模式称为<code>immediately invoked function expression</code>或<code>IIFE</code> 。 </section>
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## Instructions
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<section id="instructions">重写函数<code>makeNest</code>并删除它的调用，所以它是一个匿名的<code>immediately invoked function expression</code> （ <code>IIFE</code> ）。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 该功能应该是匿名的。
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testString: 'assert(/\(\s*?function\s*?\(\s*?\)\s*?{/.test(code), "The function should be anonymous.");'
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- text: 您的函数应在表达式的末尾加上括号以立即调用它。
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testString: 'assert(/}\s*?\)\s*?\(\s*?\)/.test(code), "Your function should have parentheses at the end of the expression to call it immediately.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function makeNest() {
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console.log("A cozy nest is ready");
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}
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makeNest();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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