- 顺序执行、并发加载
- 是否阻塞
- 依赖关系
- 引入方式
- css head中阻塞页面的渲染
- css阻塞js的执行
- css不阻塞外部脚本的加载
- 直接引入的js阻塞页面的渲染
- js不阻塞资源的加载
- js顺序执行，阻塞后续js逻辑的执行
- 图片进入可视区域之后请求图片资源
- 对于电商等图片很多，页面很长的业务场景适用
- 减少无效资源的加载
- 并发加载的资源过多会阻塞js的加载，影响网站的正常使用
- 图片等静态资源在使用之前的提前请求
- 资源使用到时能从缓存中加载，提升用户体验
- 页面展示的依赖关系维护
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