- preload 告诉浏览器立即加载资源;
- prefetch 告诉浏览器在空闲时才开始加载资源;
- preload、prefetch 仅仅是加载资源,并不会“执行”;
- preload、prefetch 均能设置、命中缓存;
- 正确使用 preload、prefetch 不会导致重复请求;
资源加载完成之前就已经完成了渲染,所以通过这两种方式资源的加载都不会阻塞关键渲染路径;
在使用 preload、prefetch 加载资源时,如果发生了页面跳转,此时没有完成的请求将会被取消掉;
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