153 lines
3.1 KiB
Markdown
153 lines
3.1 KiB
Markdown
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---
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id: 587d7fad367417b2b2512be1
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challengeType: 6
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forumTopicId: 301503
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localeTitle: 使用 onclick 属性处理点击事件
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---
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## Description
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<section id='description'>
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你希望代码仅在页面完成加载后执行。为此,你可将名为<code>DOMContentLoaded</code>的 JavaScript 事件附加到文档中。以下是实现的代码:
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```js
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document.addEventListener('DOMContentLoaded', function() {
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});
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```
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你可以在<code>DOMContentLoaded</code>函数内部添加事件处理方法。你可以添加<code>onclick</code>事件处理器,当用户点击 id 为<code>getMessage</code>的元素时会触发事件。添加以下代码:
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```js
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document.getElementById('getMessage').onclick = function(){};
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```
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</section>
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## Instructions
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<section id='instructions'>
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在<code>DOMContentLoaded</code>函数内为 id 为<code>getMessage</code>的元素添加一个 click 事件处理器。
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</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: 你的代码应该用<code>document.getElementById</code>方法来选择<code>getMessage</code>元素。
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testString: assert(code.match(/document\s*\.getElementById\(\s*?('|")getMessage\1\s*?\)/g));
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- text: 你的代码应该添加<code>onclick</code>事件处理器。
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testString: assert(typeof document.getElementById('getMessage').onclick === 'function');
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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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document.addEventListener('DOMContentLoaded', function(){
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// 在这行下面添加代码
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// 在这行上面添加代码
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});
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</script>
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<style>
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body {
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text-align: center;
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font-family: "Helvetica", sans-serif;
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}
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h1 {
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font-size: 2em;
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font-weight: bold;
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}
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.box {
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border-radius: 5px;
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background-color: #eee;
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padding: 20px 5px;
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}
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button {
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color: white;
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background-color: #4791d0;
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border-radius: 5px;
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border: 1px solid #4791d0;
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padding: 5px 10px 8px 10px;
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}
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button:hover {
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background-color: #0F5897;
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border: 1px solid #0F5897;
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}
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</style>
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<h1>Cat Photo Finder</h1>
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<p class="message box">
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The message will go here
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</p>
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<p>
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<button id="getMessage">
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Get Message
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</button>
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</p>
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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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```html
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<script>
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document.addEventListener('DOMContentLoaded', function(){
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// Add your code below this line
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document.getElementById('getMessage').onclick = function(){ };
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// Add your code above this line
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});
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</script>
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<style>
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body {
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text-align: center;
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font-family: "Helvetica", sans-serif;
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}
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h1 {
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font-size: 2em;
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font-weight: bold;
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}
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.box {
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border-radius: 5px;
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background-color: #eee;
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padding: 20px 5px;
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}
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button {
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color: white;
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background-color: #4791d0;
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border-radius: 5px;
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border: 1px solid #4791d0;
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padding: 5px 10px 8px 10px;
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}
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button:hover {
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background-color: #0F5897;
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border: 1px solid #0F5897;
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}
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</style>
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<h1>Cat Photo Finder</h1>
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<p class="message box">
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The message will go here
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</p>
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<p>
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<button id="getMessage">
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Get Message
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</button>
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</p>
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```
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</section>
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