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判断一个元素在垂直方向而言，是否在可视范围内（完全在 / 不完全在 可选）
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| /** | |
| * 原自 https://gist.github.com/simplelife7/5954021 评论区 | |
| * 由于使用了 TypeScript 才有的类型注释，这些代码不能直接复制到 JS 中运行。 | |
| */ | |
| /** | |
| * | |
| * @param {string} id 元素的 id（不包含 # 号） | |
| * @param {boolean} full 选择是否要求元素全体在可视范围内。 | |
| * 当 full 参数为 true 时，只有当该元素所有部分都在可视范围内，才会返回 true。 | |
| * 当 full 参数为 false 时（默认），只要 viewport 内出现该元素的任何一个部分（垂直而言），就会返回 true。 | |
| */ | |
| function isElementInViewport(id: string, full: boolean = false): boolean { | |
| let el = document.getElementById(id); | |
| let height = !full ? el.offsetHeight : 0; | |
| let rect = el.getBoundingClientRect(); | |
| return ( | |
| rect.top >= 0 && | |
| rect.left >= 0 && | |
| rect.bottom <= (window.innerHeight + height || document.documentElement.clientHeight + height || window.innerHeight - height || document.documentElement.clientHeight - height) && | |
| rect.right <= (window.innerWidth || document.documentElement.clientWidth) | |
| ); | |
| } |
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哇！彳亍唉