如何实现HTML天气组件？请分享天气预报组件的常见实现方法？2026-04-30 10:571阅读0评论SEO资源内容介绍文章标签相关推荐本文共计789个文字，预计阅读时间需要4分钟。直接使用 `` 嵌入第三方小部件，但需注意样式、广告、CORS 等限制。自行编写 JS 调用 API，看似独立，实际90%的失败都卡在跨域或执行时机上——不是代码写错，而是浏览器加载顺序和 API 访问规则的问题。</p> <h3>为什么 document.getElementById 报 null？DOM 还没准备好</h3> <p>把 <code>fetch</code> 写在 <code><script></code> 标签顶部，但 HTML 还没解析完，<code>document.getElementById('weather-display')</code> 必然返回 <code>null</code>。这不是 API 问题，是执行时机问题。</p> <ul> <li>把整个逻辑包进函数，比如 <code>loadWeather()</code> </li> <li>用 <code>window.addEventListener('DOMContentLoaded', loadWeather)</code> 确保 DOM 就绪</li> <li>或者把 <code><script></code> 放到 <code></body></code> 前，天然保证节点存在</li> <li>别在全局作用域里用 <code>await fetch(...)</code>，会阻塞渲染，尤其网速慢时页面“卡住”</li> </ul> <h3>为什么 fetch 天气 API 总是 CORS 报错？</h3> <p><code>Failed to load resource: net::ERR_FAILED</code> 或控制台提示 <code>No 'Access-Control-Allow-Origin' header</code>，说明浏览器直接拦截了请求——OpenWeatherMap 等主流接口默认不开放前端直连。</div><div class="article-readmore"><a 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API，看似独立，实际90%的失败都卡在跨域或执行时机上——不是代码写错，而是浏览器加载顺序和 API 访问规则的问题。</p> <h3>为什么 document.getElementById 报 null？DOM 还没准备好</h3> <p>把 <code>fetch</code> 写在 <code><script></code> 标签顶部，但 HTML 还没解析完，<code>document.getElementById('weather-display')</code> 必然返回 <code>null</code>。这不是 API 问题，是执行时机问题。</p> <ul> <li>把整个逻辑包进函数，比如 <code>loadWeather()</code> </li> <li>用 <code>window.addEventListener('DOMContentLoaded', loadWeather)</code> 确保 DOM 就绪</li> <li>或者把 <code><script></code> 放到 <code></body></code> 前，天然保证节点存在</li> <li>别在全局作用域里用 <code>await fetch(...)</code>，会阻塞渲染，尤其网速慢时页面“卡住”</li> </ul> <h3>为什么 fetch 天气 API 总是 CORS 报错？</h3> <p><code>Failed to load resource: net::ERR_FAILED</code> 或控制台提示 <code>No 'Access-Control-Allow-Origin' header</code>，说明浏览器直接拦截了请求——OpenWeatherMap 等主流接口默认不开放前端直连。</div><div class="article-readmore"><a href="/ziyuan/1777517835a133769.html?action=onClick" rel="nofollow" class="readmore-btn">阅读全文</a></div></div><div class="tab-panel" id="tab-tags"><div class="read-tags"><span 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