94 lines
		
	
	
		
			2.6 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			94 lines
		
	
	
		
			2.6 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | |||
|  | id: 587d7fad367417b2b2512be1 | |||
|  | title: Handle Click Events with JavaScript using the onclick property | |||
|  | challengeType: 6 | |||
|  | videoUrl: '' | |||
|  | localeTitle: 使用onclick属性处理使用JavaScript单击事件 | |||
|  | --- | |||
|  | 
 | |||
|  | ## Description
 | |||
|  | <section id="description">您希望代码仅在页面加载完成后执行。为此,您可以将JavaScript事件附加到名为<code>DOMContentLoaded</code>的文档中。这是执行此操作的代码: <blockquote> document.addEventListener('DOMContentLoaded',function(){ <br><br> }); </blockquote>您可以实现<code>DOMContentLoaded</code>函数内部的事件处理程序。您可以通过添加以下代码来实现<code>onclick</code>事件处理程序,该处理程序在用户单击id为<code>getMessage</code>的元素时触发: <blockquote> 。的document.getElementById( '的getMessage')的onclick =函数(){}; </blockquote></section> | |||
|  | 
 | |||
|  | ## Instructions
 | |||
|  | <section id="instructions">在<code>DOMContentLoaded</code>函数内为id为<code>getMessage</code>的元素添加一个click事件处理程序。 </section> | |||
|  | 
 | |||
|  | ## Tests
 | |||
|  | <section id='tests'> | |||
|  | 
 | |||
|  | ```yml | |||
|  | tests: | |||
|  |   - text: 您的代码应使用<code>document.getElementById</code>方法来选择<code>getMessage</code>元素。 | |||
|  |     testString: 'assert(code.match(/document\.getElementById\(\s*?("|")getMessage\1\s*?\)/g), "Your code should use the <code>document.getElementById</code> method to select the <code>getMessage</code> element.");' | |||
|  |   - text: 您的代码应添加<code>onclick</code>事件处理程序。 | |||
|  |     testString: 'assert(typeof document.getElementById("getMessage").onclick === "function", "Your code should add an <code>onclick</code> event handler.");' | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Challenge Seed
 | |||
|  | <section id='challengeSeed'> | |||
|  | 
 | |||
|  | <div id='html-seed'> | |||
|  | 
 | |||
|  | ```html | |||
|  | <script> | |||
|  |   document.addEventListener('DOMContentLoaded',function(){ | |||
|  |     // Add your code below this line | |||
|  | 
 | |||
|  | 
 | |||
|  |     // Add your code above this line | |||
|  |   }); | |||
|  | </script> | |||
|  | <style> | |||
|  |   body { | |||
|  |     text-align: center; | |||
|  |     font-family: "Helvetica", sans-serif; | |||
|  |   } | |||
|  |   h1 { | |||
|  |     font-size: 2em; | |||
|  |     font-weight: bold; | |||
|  |   } | |||
|  |   .box { | |||
|  |     border-radius: 5px; | |||
|  |     background-color: #eee; | |||
|  |     padding: 20px 5px; | |||
|  |   } | |||
|  |   button { | |||
|  |     color: white; | |||
|  |     background-color: #4791d0; | |||
|  |     border-radius: 5px; | |||
|  |     border: 1px solid #4791d0; | |||
|  |     padding: 5px 10px 8px 10px; | |||
|  |   } | |||
|  |   button:hover { | |||
|  |     background-color: #0F5897; | |||
|  |     border: 1px solid #0F5897; | |||
|  |   } | |||
|  | </style> | |||
|  | <h1>Cat Photo Finder</h1> | |||
|  | <p class="message box"> | |||
|  |   The message will go here | |||
|  | </p> | |||
|  | <p> | |||
|  |   <button id="getMessage"> | |||
|  |     Get Message | |||
|  |   </button> | |||
|  | </p> | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </div> | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Solution
 | |||
|  | <section id='solution'> | |||
|  | 
 | |||
|  | ```js | |||
|  | // solution required | |||
|  | ``` | |||
|  | </section> |