65 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			65 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
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								id: 587d7faf367417b2b2512be8
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								title: Get Geolocation Data to Find A User's GPS Coordinates
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								challengeType: 6
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								videoUrl: ''
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								localeTitle: 获取地理位置数据以查找用户的GPS坐标
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								---
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								## Description
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								<section id="description">您可以做的另一件很酷的事情是访问您用户的当前位置。每个浏览器都有一个内置的导航器,可以为您提供此信息。导航器将获得用户当前的经度和纬度。您将看到允许或阻止此站点了解您当前位置的提示。只要代码正确,挑战就可以以任何一种方式完成。通过选择允许,您将看到输出手机上的文本更改为您的纬度和经度。这是执行此操作的代码: <blockquote> if(navigator.geolocation){ <br> navigator.geolocation.getCurrentPosition(function(position){ <br> document.getElementById('data')。innerHTML =“latitude:”+ position.coords.latitude +“<br>经度:”+ position.coords.longitude; <br> }); <br> } </blockquote>首先,它检查<code>navigator.geolocation</code>对象是否存在。如果是,则调用该对象上的<code>getCurrentPosition</code>方法,该方法启动对用户位置的异步请求。如果请求成功,则运行方法中的回调函数。此函数使用点表示法访问<code>position</code>对象的纬度和经度值,并更新HTML。 </section>
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								## Instructions
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								<section id="instructions">在<code>script</code>标记内添加示例代码以检查用户的当前位置并将其插入HTML。 </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: 您的代码应使用<code>navigator.geolocation</code>来访问用户的当前位置。
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								    testString: 'assert(code.match(/navigator\.geolocation\.getCurrentPosition/g), "Your code should use <code>navigator.geolocation</code> to access the user's current location.");'
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								  - text: 您的代码应使用<code>position.coords.latitude</code>来显示用户的纬度位置。
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								    testString: 'assert(code.match(/position\.coords\.latitude/g), "Your code should use <code>position.coords.latitude</code> to display the user's latitudinal location.");'
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								  - text: 您的代码应使用<code>position.coords.longitude</code>来显示用户的纵向位置。
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								    testString: 'assert(code.match(/position\.coords\.longitude/g), "Your code should use <code>position.coords.longitude</code> to display the user's longitudinal location.");'
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								  - text: 您应该在<code>data</code> div元素中显示用户的位置。
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								    testString: 'assert(code.match(/document\.getElementById\(\s*?("|")data\1\s*?\)\.innerHTML/g), "You should display the user's position within the <code>data</code> div element.");'
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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='html-seed'>
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								```html
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								<script>
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								  // Add your code below this line
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								  // Add your code above this line
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								</script>
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								<h4>You are here:</h4>
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								<div id="data">
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								</div>
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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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