html 片段：
<div class="cover" style="position: fixed;">
    <div class="cover-img imageFullScreen">
        <img src="" alt="" class="coverImg">
        <div class="cover-close">
            <i class="fa fa-times" aria-hidden="true"></i>
        </div>
    </div>
</div>

css 片段：

    .img_wrap img {
            cursor: pointer;
        }

        .cover{
            z
 
-index: 1000;
            position: fixed;
            top: 0;
            left: 0;
            display: none;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,.5);
        }

        .cover-close{
            z-index: 1200;
            position: absolute;
            right: 
 
-3px;
            top: -10px;
            font-size: 28px;
            cursor: pointer;
            padding: 4px;
            background-color: #ffffff;
        }

        .c-pic-wrapper{
            margin-top: 10vh;
            border: 2px solid #ff0000;
        }

        .cover-img{
            width: 
 
60%;
            height: 600px;
            overflow: hidden;
            position: absolute;
            top: 5%;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            border: 10px solid #ffffff;
            background-color: #ffffff;
        }

        .coverImg{
            max-width: 100%;
            cursor:move!important;
        }

JS 片段：
<script src="e-smart-zoom-jquery.min.js"></script>
// 圖片預覽js
$('.img_wrap img').click(function(){
                var url=$(this).attr('src');
    
                $('.cover').show();
                
                $('.coverImg').attr('src',url);
    
                $('.cover-close').show();

                $('.imageFullScreen img').smartZoom();   


            })

        $('.cover-close').click(function(){
            $('.cover').hide();   
            $('.imageFullScreen img').smartZoom('destroy')
        })

應用外掛e-smart-zoom-jquery.min.js

JQ 自己轉化成JS 即可。關閉圖片引用 fontawas 的，自己更改。

function transitionEnd(){var e=document.createElement("bootstrap");var t={WebkitTransition:"webkitTransitionEnd",MozTransition:"transitionend",OTransition:"oTransitionEnd otransitionend",transition:"transitionend"};for(var n in t){if(e.style[n]!==undefined){return{end:t[n]}}}return false}(function(e){e.fn.smartZoom=function(t){function r(e){}function s(e,t){var r=n.data("smartZoomData");if(r.currentWheelDelta*t<0)r.currentWheelDelta=0;r.currentWheelDelta+=t;i.zoom(r.mouseWheelDeltaFactor*r.currentWheelDelta,{x:e.pageX,y:e.pageY})}function o(e){e.preventDefault()}function u(){var e=n.data("smartZoomData");if(e.settings.mouseMoveEnabled!=true||e.settings.moveCursorEnabled!=true)return;var t=S();var r=t.width/e.originalSize.width;if(parseInt(r*100)>parseInt(e.adjustedPosInfos.scale*100))n.css({cursor:"move"});else n.css({cursor:"default"})}function a(e){m(e.pageX,e.pageY)}function f(t){t.preventDefault();e(document).on("mousemove.smartZoom",l);e(document).bind("mouseup.smartZoom",c);var r=n.data("smartZoomData");r.moveCurrentPosition=new A(t.pageX,t.pageY);r.moveLastPosition=new A(t.pageX,t.pageY)}function l(e){var t=n.data("smartZoomData");if(t.mouseMoveForPan||!t.mouseMoveForPan&&t.moveCurrentPosition.x!=e.pageX&&t.moveCurrentPosition.y!=e.pageY){t.mouseMoveForPan=true;v(e.pageX,e.pageY,0,false)}}function c(t){var r=n.data("smartZoomData");if(r.mouseMoveForPan){r.mouseMoveForPan=false;if(r.moveLastPosition.distance(r.moveCurrentPosition)>4){var i=r.moveLastPosition.interpolate(r.moveCurrentPosition,-4);v(i.x,i.y,500,true)}else{v(r.moveLastPosition.x,r.moveLastPosition.y,0,true)}}else if(r.settings.zoomOnSimpleClick){m(t.pageX,t.pageY)}e(document).unbind("mousemove.smartZoom");e(document).unbind("mouseup.smartZoom")}function h(t){t.preventDefault();e(document).unbind("touchmove.smartZoom");e(document).unbind("touchend.smartZoom");e(document).bind("touchmove.smartZoom",p);e(document).bind("touchend.smartZoom",d);var r=t.originalEvent.touches;var i=r[0];var s=n.data("smartZoomData");s.touch.touchMove=false;s.touch.touchPinch=false;s.moveCurrentPosition=new A(i.pageX,i.pageY);s.moveLastPosition=new A(i.pageX,i.pageY);s.touch.lastTouchPositionArr=new Array;var o;var u=r.length;for(var a=0;a<u;++a){o=r[a];s.touch.lastTouchPositionArr.push(new A(o.pageX,o.pageY))}}function p(e){e.preventDefault();var t=n.data("smartZoomData");var r=e.originalEvent.touches;var s=r.length;var o=r[0];if(s==1&&!t.touch.touchPinch&&t.settings.touchMoveEnabled==true){if(!t.touch.touchMove){var u=t.touch.lastTouchPositionArr[0];if(u.distance(new A(o.pageX,o.pageY))<3){return}else t.touch.touchMove=true}v(o.pageX,o.pageY,0,false)}else if(s==2&&!t.touch.touchMove&&t.settings.pinchEnabled==true){t.touch.touchPinch=true;var a=r[1];var f=t.touch.lastTouchPositionArr[0];var l=t.touch.lastTouchPositionArr[1];var c=new A(o.pageX,o.pageY);var h=new A(a.pageX,a.pageY);var p=c.distance(h);var d=f.distance(l);var m=p-d;if(Math.abs(m)<3)return;var g=new A((c.x+h.x)/2,(c.y+h.y)/2);var y=S();var b=t.originalSize;var w=y.width/b.width;var E=p/d;var x=y.width*E/b.width;i.zoom(x-w,g,0);t.touch.lastTouchPositionArr[0]=c;t.touch.lastTouchPositionArr[1]=h}}function d(t){t.preventDefault();var r=t.originalEvent.touches.length;if(r==0){e(document).unbind("touchmove.smartZoom");e(document).unbind("touchend.smartZoom")}var i=n.data("smartZoomData");if(i.touch.touchPinch)return;if(i.touch.touchMove){if(i.moveLastPosition.distance(i.moveCurrentPosition)>2){var s=i.moveLastPosition.interpolate(i.moveCurrentPosition,-4);v(s.x,s.y,500,true)}}else{if(i.settings.dblTapEnabled==true&&i.touch.lastTouchEndTime!=0&&(new Date).getTime()-i.touch.lastTouchEndTime<400){var o=i.touch.lastTouchPositionArr[0];m(o.x,o.y)}i.touch.lastTouchEndTime=(new Date).getTime()}}function v(e,t,i,s){g(r.PAN);var o=n.data("smartZoomData");o.moveLastPosition.x=o.moveCurrentPosition.x;o.moveLastPosition.y=o.moveCurrentPosition.y;var u=n.offset();var a=S();var f=u.left+(e-o.moveCurrentPosition.x);var l=u.top+(t-o.moveCurrentPosition.y);var c=y(f,l,a.width,a.height);x(r.PAN,r.START,false);E(n,c.x,c.y,a.width,a.height,i,s==true?function(){x(r.PAN,r.END,false)}:null);o.moveCurrentPosition.x=e;o.moveCurrentPosition.y=t}function m(e,t){var r=n.data("smartZoomData");var s=r.originalSize;var o=S();var u=o.width/s.width;var a=r.adjustedPosInfos.scale;var f=parseFloat(r.settings.dblClickMaxScale);var l;if(u.toFixed(2)>f.toFixed(2)||Math.abs(f-u)>Math.abs(u-a)){l=f-u}else{l=a-u}i.zoom(l,{x:e,y:t})}function g(t){var r=n.data("smartZoomData");if(r.transitionObject){if(r.transitionObject.cssAnimHandler)n.off(e.support.transition,r.transitionObject.cssAnimTimer);var i=r.originalSize;var s=S();var o=new Object;o[r.transitionObject.transition]="all 0s";if(r.transitionObject.css3dSupported){o[r.transitionObject.transform]="translate3d("+s.x+"px, "+s.y+"px, 0) scale3d("+s.width/i.width+","+s.height/i.height+", 1)"}else{o[r.transitionObject.transform]="translateX("+s.x+"px) translateY("+s.y+"px) scale("+s.width/i.width+","+s.height/i.height+")"}n.css(o)}else{n.stop()}u();if(t!=null)x(t,"",true)}function y(e,t,r,i){var s=n.data("smartZoomData");var o=Math.min(s.adjustedPosInfos.top,t);o+=Math.max(0,s.adjustedPosInfos.top+s.adjustedPosInfos.height-(o+i));var u=Math.min(s.adjustedPosInfos.left,e);u+=Math.max(0,s.adjustedPosInfos.left+s.adjustedPosInfos.width-(u+r));return new A(u.toFixed(2),o.toFixed(2))}function b(e){n.unbind("load.smartZoom");i.init.apply(n,[e.data.arguments])}function w(){var e=n.data("smartZoomData");var t=e.containerDiv;var r=e.originalSize;var i=t.parent().offset();var s=C(e.settings.left,i.left,t.parent().width());var o=C(e.settings.top,i.top,t.parent().height());t.offset({left:s,top:o});t.width(N(e.settings.width,t.parent().width(),s-i.left));t.height(N(e.settings.height,t.parent().height(),o-i.top));var a=L(t);var f=Math.min(Math.min(a.width/r.width,a.height/r.height),1).toFixed(2);var l=r.width*f;var c=r.height*f;e.adjustedPosInfos={left:(a.width-l)/2+i.left,top:(a.height-c)/2+i.top,width:l,height:c,scale:f};g();E(n,e.adjustedPosInfos.left,e.adjustedPosInfos.top,l,c,0,function(){n.css("visibility","visible")});u()}function E(t,r,i,s,o,u,a){var f=n.data("smartZoomData");var l=f.containerDiv.offset();var c=r-l.left;var h=i-l.top;if(f.transitionObject!=null){var p=f.originalSize;var d=new Object;d[f.transitionObject.transform+"-origin"]="0 0";d[f.transitionObject.transition]="all "+u/1e3+"s ease-out";if(f.transitionObject.css3dSupported)d[f.transitionObject.transform]="translate3d("+c+"px, "+h+"px, 0) scale3d("+s/p.width+","+o/p.height+", 1)";else d[f.transitionObject.transform]="translateX("+c+"px) translateY("+h+"px) scale("+s/p.width+","+o/p.height+")";if(a!=null){f.transitionObject.cssAnimHandler=a;t.one(e.support.transition.end,f.transitionObject.cssAnimHandler)}t.css(d)}else{t.animate({"margin-left":c,"margin-top":h,width:s,height:o},{duration:u,easing:f.settings.easing,complete:function(){if(a!=null)a()}})}}function S(e){var t=n.data("smartZoomData");var r=n.width();var i=n.height();var s=n.offset();var o=parseInt(s.left);var u=parseInt(s.top);var a=t.containerDiv.offset();if(e!=true){o=parseInt(o)-a.left;u=parseInt(u)-a.top}if(t.transitionObject!=null){var f=n.css(t.transitionObject.transform);if(f&&f!=""&&f.search("matrix")!=-1){var l;var c;if(f.search("matrix3d")!=-1){c=f.replace("matrix3d(","").replace(")","").split(",");l=c[0]}else{c=f.replace("matrix(","").replace(")","").split(",");l=c[3];o=parseFloat(c[4]);u=parseFloat(c[5]);if(e){o=parseFloat(o)+a.left;u=parseFloat(u)+a.top}}r=l*r;i=l*i}}return{x:o,y:u,width:r,height:i}}function x(e,t,i){var s=n.data("smartZoomData");var o="";if(i==true&&s.currentActionType!=e){o=s.currentActionType+"_"+r.END;s.currentActionType="";s.currentActionStep=""}else{if(s.currentActionType!=e||s.currentActionStep==r.END){s.currentActionType=e;s.currentActionStep=r.START;o=s.currentActionType+"_"+s.currentActionStep}else if(s.currentActionType==e&&t==r.END){s.currentActionStep=r.END;o=s.currentActionType+"_"+s.currentActionStep;s.currentActionType="";s.currentActionStep=""}}if(o!=""){var u=jQuery.Event(o);u.targetRect=S(true);u.scale=u.targetRect.width/s.originalSize.width;n.trigger(u)}}function T(){var t=document.body||document.documentElement;var n=t.style;var r=["transition","WebkitTransition","MozTransition","MsTransition","OTransition"];var i=["transition","-webkit-transition","-moz-transition","-ms-transition","-o-transition"];var s=["transform","-webkit-transform","-moz-transform","-ms-transform","-o-transform"];var o=r.length;var u;for(var a=0;a<o;a++){if(n[r[a]]!=null){transformStr=s[a];var f=e('<div style="position:absolute;">Translate3d Test</div>');e("body").append(f);u=new Object;u[s[a]]="translate3d(20px,0,0)";f.css(u);css3dSupported=f.offset().left-e("body").offset().left==20;f.empty().remove();if(css3dSupported){return{transition:i[a],transform:s[a],css3dSupported:css3dSupported}}}}return null}function N(e,t,n){if(e.search&&e.search("%")!=-1)return(t-n)*(parseInt(e)/100);else return parseInt(e)}function C(e,t,n){if(e.search&&e.search("%")!=-1)return t+n*(parseInt(e)/100);else return t+parseInt(e)}function k(){w()}function L(e){var t=e.offset();if(!t)return null;var n=t.left;var r=t.top;return{x:n,y:r,width:e.outerWidth(),height:e.outerHeight()}}function A(e,t){this.x=e;this.y=t;this.toString=function(){return"(x="+this.x+", y="+this.y+")"};this.interpolate=function(e,t){var n=t*this.x+(1-t)*e.x;var r=t*this.y+(1-t)*e.y;return new A(n,r)};this.distance=function(e){return Math.sqrt(Math.pow(e.y-this.y,2)+Math.pow(e.x-this.x,2))}}var n=this;r.ZOOM="SmartZoom_ZOOM";r.PAN="SmartZoom_PAN";r.START="START";r.END="END";r.DESTROYED="SmartZoom_DESTROYED";var i={init:function(t){if(n.data("smartZoomData"))return;settings=e.extend({top:"0",left:"0",width:"100%",height:"100%",easing:"smartZoomEasing",initCallback:null,maxScale:3,dblClickMaxScale:1.8,mouseEnabled:true,scrollEnabled:true,dblClickEnabled:true,mouseMoveEnabled:true,moveCursorEnabled:true,adjustOnResize:true,touchEnabled:true,dblTapEnabled:true,zoomOnSimpleClick:false,pinchEnabled:true,touchMoveEnabled:true,containerBackground:"#FFFFFF",containerClass:""},t);var r=n.attr("style");var i="smartZoomContainer"+(new Date).getTime();var u=e('<div id="'+i+'" class="'+settings.containerClass+'"></div>');n.before(u);n.remove();u=e("#"+i);u.css({overflow:"hidden"});if(settings.containerClass=="")u.css({"background-color":settings.containerBackground});u.append(n);var l=new Object;l.lastTouchEndTime=0;l.lastTouchPositionArr=null;l.touchMove=false;l.touchPinch=false;n.data("smartZoomData",{settings:settings,containerDiv:u,originalSize:{width:n.width(),height:n.height()},originalPosition:n.offset(),transitionObject:T(),touch:l,mouseWheelDeltaFactor:.15,currentWheelDelta:0,adjustedPosInfos:null,moveCurrentPosition:null,moveLastPosition:null,mouseMoveForPan:false,currentActionType:"",initialStyles:r,currentActionStep:""});w();if(settings.touchEnabled==true)n.bind("touchstart.smartZoom",h);if(settings.mouseEnabled==true){if(settings.mouseMoveEnabled==true)n.bind("mousedown.smartZoom",f);if(settings.scrollEnabled==true){u.bind("mousewheel.smartZoom",s);u.bind("mousewheel.smartZoom DOMMouseScroll.smartZoom",o)}if(settings.dblClickEnabled==true&&settings.zoomOnSimpleClick==false)u.bind("dblclick.smartZoom",a)}document.ondragstart=function(){return false};if(settings.adjustOnResize==true)e(window).bind("resize.smartZoom",k);if(settings.initCallback!=null)settings.initCallback.apply(this,n)},zoom:function(e,t,i){var s=n.data("smartZoomData");var o;var a;if(!t){var f=L(s.containerDiv);o=f.x+f.width/2;a=f.y+f.height/2}else{o=t.x;a=t.y}g(r.ZOOM);var l=S(true);var c=s.originalSize;var h=l.width/c.width+e;h=Math.max(s.adjustedPosInfos.scale,h);h=Math.min(s.settings.maxScale,h);var p=c.width*h;var d=c.height*h;var v=o-l.x;var m=a-l.y;var b=p/l.width;var w=l.x-(v*b-v);var T=l.y-(m*b-m);var N=y(w,T,p,d);if(i==null)i=700;x(r.ZOOM,r.START,false);E(n,N.x,N.y,p,d,i,function(){s.currentWheelDelta=0;u();x(r.ZOOM,r.END,false)})},pan:function(e,t,i){if(e==null||t==null)return;if(i==null)i=700;var s=n.offset();var o=S();var u=y(s.left+e,s.top+t,o.width,o.height);if(u.x!=s.left||u.y!=s.top){g(r.PAN);x(r.PAN,r.START,false);E(n,u.x,u.y,o.width,o.height,i,function(){x(r.PAN,r.END,false)})}},destroy:function(){var t=n.data("smartZoomData");if(!t)return;g();var i=t.containerDiv;n.unbind("mousedown.smartZoom");n.bind("touchstart.smartZoom");i.unbind("mousewheel.smartZoom");i.unbind("dblclick.smartZoom");i.unbind("mousewheel.smartZoom DOMMouseScroll.smartZoom");e(window).unbind("resize.smartZoom");e(document).unbind("mousemove.smartZoom");e(document).unbind("mouseup.smartZoom");e(document).unbind("touchmove.smartZoom");e(document).unbind("touchend.smartZoom");n.css({cursor:"default"});i.before(n);E(n,t.originalPosition.left,t.originalPosition.top,t.originalSize.width,t.originalSize.height,5);n.removeData("smartZoomData");i.remove();n.attr("style",t.initialStyles);n.trigger(r.DESTROYED)},isPluginActive:function(){return n.data("smartZoomData")!=undefined}};if(i[t]){return i[t].apply(this,Array.prototype.slice.call(arguments,1))}else if(typeof t==="object"||!t){if(n[0].tagName.toLowerCase()=="img"&&!n[0].complete){n.bind("load.smartZoom",{arguments:arguments[0]},b)}else{i.init.apply(n,[arguments[0]])}}else{e.error("Method "+t+" does not exist on e-smartzoom jquery plugin")}}})(jQuery);(function(e){e.extend(e.easing,{smartZoomEasing:function(t,n,r,i,s){return e.easing["smartZoomOutQuad"](t,n,r,i,s)},smartZoomOutQuad:function(e,t,n,r,i){return-r*(t/=i)*(t-2)+n}})})(jQuery);(function(e){function t(t){var n=t||window.event,r=[].slice.call(arguments,1),i=0,s=true,o=0,u=0;t=e.event.fix(n);t.type="mousewheel";if(n.wheelDelta){i=n.wheelDelta/120}if(n.detail){i=-n.detail/3}u=i;if(n.axis!==undefined&&n.axis===n.HORIZONTAL_AXIS){u=0;o=-1*i}if(n.wheelDeltaY!==undefined){u=n.wheelDeltaY/120}if(n.wheelDeltaX!==undefined){o=-1*n.wheelDeltaX/120}r.unshift(t,i,o,u);return(e.event.dispatch||e.event.handle).apply(this,r)}var n=["DOMMouseScroll","mousewheel"];if(e.event.fixHooks){for(var r=n.length;r;){e.event.fixHooks[n[--r]]=e.event.mouseHooks}}e.event.special.mousewheel={setup:function(){if(this.addEventListener){for(var e=n.length;e;){this.addEventListener(n[--e],t,false)}}else{this.onmousewheel=t}},teardown:function(){if(this.removeEventListener){for(var e=n.length;e;){this.removeEventListener(n[--e],t,false)}}else{this.onmousewheel=null}}};e.fn.extend({mousewheel:function(e){return e?this.bind("mousewheel",e):this.trigger("mousewheel")},unmousewheel:function(e){return this.unbind("mousewheel",e)}})})(jQuery);$.fn.emulateTransitionEnd=function(e){var t=false,n=this;$(this).one($.support.transition.end,function(){t=true});var r=function(){if(!t)$(n).trigger($.support.transition.end)};setTimeout(r,e);return this};$(function(){$.support.transition=transitionEnd()})