javascript - Different size images in website depending on screen resolution -


i have website images, , page loading can slow on mobile devices have mobile internet connection. so, question is: assign different images, smaller or bigger depending on device, when page loaded solution?

example img in dom be:

<img src="" id="img1" alt="img1" />

and then, adding script in head:

$(document).ready(function () {                loadimg();             })

the loadimg function can like:

if((window.screen.availheight < 1234)&&(window.screen.availwidth < 1234)) document.getelementbyid("img1").src = "small"; else document.getelementbyid("img1").src = "big";

try js library https://github.com/scottjehl/picturefill

i don't know how affects seo, though.


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