Lightbox

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/** * @author github.com@flymysql */ let container = document.documentElement||document.body; let img,div,src,btnleft,btnright; var imgid=0; let x,y,w,h,tx,ty,tw,th,ww,wh; let closeMove=function(){ if(div==undefined){ return false; } div.style.opacity=0; img.style.height=h+"px"; img.style.width=w+"px"; img.style.left=x+"px"; img.style.top=(y - container.scrollTop)+"px"; // 延迟移除 dom setTimeout(function(){ div.remove(); img.remove(); btnright.remove(); btnleft.remove(); },100); }; let closeFade=function(){ if(div==undefined){ return false; } div.style.opacity=0; img.style.opacity=0; // 延迟移除 dom setTimeout(function(){ div.remove(); img.remove(); btnright.remove(); btnleft.remove(); },100); }; let style=function() { btnleft.style.cssText=` position:fixed; border-radius: 50%;; left:${x - 20}px; top:${y - container.scrollTop + h/2}px; width:50px; height:50px; border: 0px; background-color: rgba(200,200,200,0.8); font-size: 20px; z-index: 999999999; transition:all .3s cubic-bezier(0.165, 0.84, 0.44, 1); `; btnright.style.cssText=` position:fixed; border-radius: 50%; left:${x + w + 20}px; top:${y - container.scrollTop + h/2}px; width:50px; border: 0px; height:50px; font-size: 20px; background-color: rgba(200,200,200,0.8); z-index: 999999999; transition:all .3s cubic-bezier(0.165, 0.84, 0.44, 1); `; btnleft.innerText="<"; btnright.innerText=">"; img.style.cssText=` position:fixed; border-radius: 12px; left:${x}px; top:${y - container.scrollTop}px; width:${w}px; height:${h}px; z-index: 999999999; transition:all .3s cubic-bezier(0.165, 0.84, 0.44, 1); opacity:0; `; } // 监听滚动关闭层 document.addEventListener("scroll",function(){ closeFade(); }); document.querySelectorAll("img").forEach(v=>{ if (v.parentNode.localName!='a') { v.id=imgid; imgid++; v.addEventListener("click",function(e){ // 注册事件 // 记录小图的位置个大小 x=e.target.offsetLeft; y=e.target.offsetTop; w=e.target.offsetWidth; h=e.target.offsetHeight; src=e.target.src; id=e.target.id; // 创建遮罩层 div=document.createElement("div"); div.style.cssText=` position:fixed; left:0; top:0; bottom:0; right:0; background-color: rgba(25,25,25,0.8); z-index:99999999; transition:all .3s cubic-bezier(0.165, 0.84, 0.44, 1); `; document.body.appendChild(div); setTimeout(function(){ div.style.opacity=1; },0); // （此处可以加 loading) // 创建副本 img=new Image(); btnright=document.createElement("button"); btnleft=document.createElement("button"); img.src=src; style(); btnleft.onclick=function(){ if(id===0){ alert("已经是第一张了！"); return; } var left=document.getElementById(id-1); img.src=left.src; x=left.offsetLeft; y=left.offsetTop; w=left.offsetWidth; h=left.offsetHeight; style(); id--; } btnright.onclick=function(){ id++; if(id>=imgid){ alert("已经是最后一张了！"); return; } var right=document.getElementById(id); img.src=right.src; x=right.offsetLeft; y=right.offsetTop; w=right.offsetWidth; h=right.offsetHeight; style(); } img.onload=function(){ document.body.appendChild(img); document.body.appendChild(btnright); document.body.appendChild(btnleft); // 浏览器宽高 wh=window.innerHeight; ww=window.innerWidth; // 目标宽高和坐标 if(w/h<ww/wh){ th=wh-80; tw=w/h*th >> 0; tx=(ww - tw) / 2; ty=40; } else{ tw=ww*0.8; th=h/w*tw >> 0; tx=ww*0.1; ty=(wh-th)/2; } // 延迟写入否则不会有动画 setTimeout(function(){ img.style.opacity=1; img.style.height=th+"px"; img.style.width=tw+"px"; img.style.left=tx+"px"; img.style.top=ty+"px"; btnleft.style.left=(tx-90)+"px"; btnleft.style.top=(ty+th/2)+"px"; btnright.style.left=(tx+tw+40)+"px"; btnright.style.top=(ty+th/2)+"px"; // 点击隐藏 div.onclick=img.onclick=closeMove; },10); }; });//end event } });//end forEach

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<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> <link href="/path/to/jquery.fancybox.min.css" rel="stylesheet"> <script src="/path/to/jquery.fancybox.min.js"></script>

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<a data-fancybox="gallery" href="big_1.jpg"> <img src="small_1.jpg"> </a> <a data-fancybox="gallery" href="big_2.jpg"> <img src="small_2.jpg"> </a>