171 lines
3.7 KiB
Markdown
171 lines
3.7 KiB
Markdown
---
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id: 587d7fae367417b2b2512be6
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challengeType: 6
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forumTopicId: 18265
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title: 渲染数据源的图像
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---
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## Description
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<section id='description'>
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前几个挑战中表明，JSON 数组中的每个对象都包含一个<code>imageLink</code>键，其值为猫图像的 URL。
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当你遍历这些对象的时候，你可以使用<code>imageLink</code>属性在<code>img</code>元素中显示此图像。
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这是执行此操作的代码：
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<code>html += "<img src = '" + val.imageLink + "' " + "alt='" + val.altText + "'>";</code>
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</section>
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## Instructions
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<section id='instructions'>
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添加代码以在<code>img</code>标签中使用<code>imageLink</code>和<code>altText</code>属性。
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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: 你应该使用<code>imageLink</code>属性来显示图像。
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testString: assert(code.match(/val\.imageLink/g));
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- text: 应该用 <code>altText</code> 做为图片的 alt 属性。
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testString: assert(code.match(/val\.altText/g));
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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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document.getElementById('getMessage').onclick = function(){
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const req=new XMLHttpRequest();
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req.open("GET",'/json/cats.json',true);
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req.send();
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req.onload = function(){
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const json = JSON.parse(req.responseText);
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let html = "";
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json.forEach(function(val) {
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html += "<div class = 'cat'>";
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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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html += "</div><br>";
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});
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document.getElementsByClassName('message')[0].innerHTML=html;
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};
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};
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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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document.getElementById('getMessage').onclick = function(){
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const req = new XMLHttpRequest();
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req.open("GET",'/json/cats.json',true);
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req.send();
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req.onload = function(){
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const json = JSON.parse(req.responseText);
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let html = "";
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json.forEach(function(val) {
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html += "<div class = 'cat'>";
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// Add your code below this line
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html += "<img src = '" + val.imageLink + "' " + "alt='" + val.altText + "'>";
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// Add your code above this line
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html += "</div><br>";
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});
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document.getElementsByClassName('message')[0].innerHTML = html;
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};
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};
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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">
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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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