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这样的是主动适应
<picture>
<source srcset="assets/img/hero--large.jpg 1920w, assets/img/hero--large-hi-dpi.jpg 3840w" media="(min-width:1380px)">
<source srcset="assets/img/hero--medium.jpg 1380w, assets/img/hero--medium-hi-dpi.jpg 2760w" media="(min-width:990px)">
<source srcset="assets/img/hero--small.jpg 990w, assets/img/hero--small-hi-dpi.jpg 1980w" media="(min-width:640px)">
<img srcset="assets/img/hero--smaller.jpg 640w, assets/img/hero--smaller-hi-dpi.jpg 1280w" alt="Costal view of ocean and mountains"
class="large-banner__img">
</picture>
这样的是被动适应,移动优先是肯定的
<img sizes="(min-width:970px) 976px,100vw" srcset="assets/img/first-trip-low-res.jpg 565w, assets/img/first-trip.jpg 976w,assets/img/first-trip-hi-dpi.jpg 1952w"
alt="Couple walking down a street.">
img {
max-width: 50vw;
}