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This article is about how JavaScript achieves the effect of commodity magnifying glass. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The details are as follows

HTML+CSS section:

.small {position: relative; width: 400px; height: 450px; border: 1px solid # ccc;} .small img {width: 100%; height: 100%;} .small .mask {position: absolute; left: 0; top: 0 Width: 300px; height: 300px; background-color: rgba (0,255,0, .2);} .big {position: absolute; left: 450px; top: 8px; width: 550px; height: 550px; border: 1px solid # ccc; overflow: hidden Display: none;} .big img {position: absolute; left: 0; top: 0;}

JS section:

Var small=document.querySelector ('.small'); var mask=document.querySelector ('.mask'); var big=document.querySelector ('.big'); var bigImg=document.querySelector ('.big > img'); / / get the width and height of the large image var bigWidth=bigImg.offsetWidth; var bigHeight=bigImg.offsetHeight; / / function move (e) {var x=e.pageX-this.offsetLeft Var y=e.pageY-this.offsetTop; console.log (x maskWidth+'px'; mask.style.top y); / / move mask position var maskHeight = mask.offsetHeight/2; var maskWidth = mask.offsetWidth/2; mask.style.left = x-maskWidth+'px'; mask.style.top = y-maskHeight+'px' / / limit the movement range of the mask / / console.log ('mask.offsetTop',mask.offsetTop); / / console.log (' mask.offsetLeft',mask.offsetLeft); var maxLeft=small.offsetWidth-mask.offsetWidth; if (mask.offsetTop small.offsetWidth-mask.offsetWidth) {mask.style.left = maxLeft+'px' } if (mask.offsetLeft small.offsetHeight-mask.offsetHeight) {mask.style.top = small.offsetHeight-mask.offsetHeight + 'px' } / / bigImg big picture big big box big picture move / / (bigImg.offsetWidth-big.offsetWidth) / (samll.offsetWidtth-mask.offsetWidth) / / the maximum moving distance of the big image =-the moving distance of the mask * the maximum moving distance of the big image / the maximum moving distance of the mask bigImg.style.left =-mask.offsetLeft* (bigImg.offsetWidth-big.offsetWidth) / (small.offsetWidth-mask.offsetWidth) + "px" BigImg.style.top =-mask.offsetTop* (bigImg.offsetHeight-big.offsetHeight) / (small.offsetHeight-mask.offsetHeight) + "px";} / / move mask small.addEventListener ('mousemove',move) on the small image; small.addEventListener (' mouseover',function () {big.style.display='block'; mask.style.display='block') }) small.addEventListener ('mouseout',function () {big.style.display='none'; mask.style.display='none';})

Demonstration of the effect:

Thank you for reading! This is the end of the article on "how to achieve the effect of commodity magnifying glass in JavaScript". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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