98 lines
3.3 KiB
Markdown
98 lines
3.3 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244bd
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title: Passing Values to Functions with Arguments
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challengeType: 1
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videoUrl: ''
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localeTitle: 将值传递给带参数的函数
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---
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## Description
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<section id="description"> <dfn>参数</dfn>是变量，它们作为调用函数时要输入到函数的值的占位符。定义函数时，通常将其与一个或多个参数一起定义。调用函数时输入（或<dfn>“传递”</dfn> ）的实际值称为<dfn>参数</dfn> 。这是一个带有两个参数的函数， <code>param1</code>和<code>param2</code> ： <blockquote> function testFun（param1，param2）{ <br> console.log（param1，param2）; <br> } </blockquote>然后我们可以调用<code>testFun</code> ： <code>testFun("Hello", "World");</code>我们通过了两个论点， <code>"Hello"</code>和<code>"World"</code> 。在函数内部， <code>param1</code>将等于“Hello”， <code>param2</code>将等于“World”。请注意，您可以使用不同的参数再次调用<code>testFun</code> ，并且参数将采用新参数的值。 </section>
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## Instructions
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<section id="instructions"><ol><li>创建一个名为<code>functionWithArgs</code> ，该函数接受两个参数并将其总和输出到开发控制台。 </li><li>使用两个数字作为参数调用该函数。 </li></ol></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: <code>functionWithArgs</code>应该是一个函数
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testString: 'assert(typeof functionWithArgs === "function", "<code>functionWithArgs</code> should be a function");'
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- text: '<code>functionWithArgs(1,2)</code>应该输出<code>3</code>'
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testString: 'if(typeof functionWithArgs === "function") { capture(); functionWithArgs(1,2); uncapture(); } assert(logOutput == 3, "<code>functionWithArgs(1,2)</code> should output <code>3</code>");'
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- text: '<code>functionWithArgs(7,9)</code>应该输出<code>16</code>'
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testString: 'if(typeof functionWithArgs === "function") { capture(); functionWithArgs(7,9); uncapture(); } assert(logOutput == 16, "<code>functionWithArgs(7,9)</code> should output <code>16</code>");'
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- text: 定义后，使用两个数字调用<code>functionWithArgs</code> 。
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testString: 'assert(/^\s*functionWithArgs\s*\(\s*\d+\s*,\s*\d+\s*\)\s*;/m.test(code), "Call <code>functionWithArgs</code> with two numbers after you define it.");'
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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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// Example
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function ourFunctionWithArgs(a, b) {
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console.log(a - b);
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}
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ourFunctionWithArgs(10, 5); // Outputs 5
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// Only change code below this line.
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```
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</div>
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### Before Test
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<div id='js-setup'>
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```js
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var logOutput = "";
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var originalConsole = console
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function capture() {
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var nativeLog = console.log;
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console.log = function (message) {
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if(message) logOutput = JSON.stringify(message).trim();
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if(nativeLog.apply) {
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nativeLog.apply(originalConsole, arguments);
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} else {
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var nativeMsg = Array.prototype.slice.apply(arguments).join(' ');
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nativeLog(nativeMsg);
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}
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};
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}
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function uncapture() {
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console.log = originalConsole.log;
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}
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capture();
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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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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