本文实例讲述了JS实现的仿QQ空间图片弹出效果代码。分享给大家供大家参考，具体如下：

<script type="text/javascript"> function imageShow(which_click) { var image_path = which_click; //alert(image_path); var tag_top = Math.max(document.documentElement.scrollTop, document.body.scrollTop); //创建底层灰色DIV var index_tag = document.createElement("div"); index_tag.style.cssText = "width:100%;height:"+Math.max(document.body.clientHeight,document.body.offsetHeight,document.documentElement.clientHeight)+"px;position:relative;background:black;top:0;filter: Alpha(Opacity=80);Opacity:0.8;"; document.body.appendChild(index_tag); //index_tag.ondblclick = closeIndexTag; index_tag.onclick = closeIndexTag; //创建图片DIV var img_tag = document.createElement("div"); img_tag.style.cssText = "font:12px/18px verdana;overflow:auto;text-align:center;position:absolute;width:200px;border:5px solid white;background:white;color:white;left:"+(parseInt(document.body.offsetWidth)/2-100)+"px;top:"+(document.documentElement.clientHeight/3+tag_top)+"px;"; img_tag.innerHTML = "<div><img src='images/loading.gif' /><br /><br /><b>Image loading...</b><br /></div>"; img_tag.oncontextmenu = function() { var clsOK=confirm("是否确定关闭图片显示"); if(clsOK) closeIndexTag(); return false; } img_tag.onclick = closeIndexTag; //img_tag.onmousemove = barDidplay; document.body.appendChild(img_tag); //构建图片关闭按钮 var close_tag = document.createElement("div"); close_tag.style.cssText = "display:none;position:absolute;left:10px;top:10px;color:black;"; close_tag.innerHTML = "<b> 关闭 </b>"; close_tag.onclick = closeIndexTag; var img = new Image(); img.src = image_path; img.style.cssText = "border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;cursor:pointer"; img.onload = imgOK(); function imgOK() { var temp = 0; var stop_x = false; var stop_y = false; var img_tag_x = img_tag.offsetWidth; var img_tag_y = img_tag.offsetHeight; var img_x = img.width; var img_y = img.height; var scroll_x=document.documentElement.clientWidth; var scroll_y=window.innerHeight||document.documentElement.clientHeight; var yy = 0; var xx = 0; if(img_y > scroll_y || img_x > scroll_x){ yy = scroll_y - 100; xx = (img_x / img_y) * yy; }else{ xx = img_x + 4; yy = img_y + 3; } img.style.width=xx-4+'px'; img.style.height=yy-3+'px'; var maxTime = setInterval(function() { temp += 30; if((img_tag_x + temp) < xx) { img_tag.style.width = (img_tag_x + temp) + "px"; img_tag.style.left = (scroll_x - img_tag_x - temp)/2 + "px"; } else { stop_x = true; img_tag.style.width = xx + "px"; img_tag.style.left = (scroll_x - xx)/2 + "px"; } if((img_tag_y + temp) < yy) { img_tag.style.height = (img_tag_y + temp) + "px"; img_tag.style.top = (tag_top + (scroll_y - img_tag_y - temp)/2) + "px"; } else { stop_y = true; img_tag.style.height = yy + "px"; img_tag.style.top = (tag_top + (scroll_y - yy)/2) + "px"; } if(stop_x && stop_y) { clearInterval(maxTime); img_tag.appendChild(img); temp = 0; imgOpacity(temp); } }, 1); img_tag.innerHTML=""; img_tag.appendChild(close_tag); } function closeIndexTag() { document.body.removeChild(index_tag); document.body.removeChild(img_tag); } function imgOpacity(temp_imgOpacity) { var temp = temp_imgOpacity; temp += 10; img.style.filter = "alpha(opacity=" + temp + ")"; img.style.opacity = temp/100; var imgTime = setTimeout(function() {imgOpacity(temp);}, 10); if(temp > 100) clearTimeout(imgTime); } var bar_show; function barDidplay(){ clearTimeout(bar_show); close_tag.style.display = "block"; bar_show = setTimeout(function() {close_tag.style.display = "none"}, 1000); } } </script>

html部分：

<a href="javascript:;"> <span>图片效果</span> </a>

希望本文所述对大家JavaScript程序设计有所帮助。