jqzoom插件实现图片放大镜效果。
图1.1jqzoom插件实现图片放大镜效果
1、引入jqurty和jqzoom插件
<script src="https://www.jb51.net/js/common/jquery-1.6.2.js" type="text/javascript"></script> <script src="https://www.jb51.net/js/common/jquery.jqzoom.js" type="text/javascript"></script>
2、应用官方网站给定的样式
/*jQzoom*/ .jqzoom{ border:1px solid #BBB; float:left; position:relative; padding:0px; cursor:pointer; } div.zoomdiv { z-index: 999; position : absolute; top:0px; left:0px; width : 200px; height : 200px; background: #ffffff; border:1px solid #CCCCCC; display:none; text-align: center; overflow: hidden; } div.jqZoomPup { z-index : 999; visibility : hidden; position : absolute; top:0px; left:0px; width : 50px; height : 50px; border: 1px solid #aaa; background: #ffffff url(/images/shopping/zoomlens.gif) 50% top no-repeat; opacity: 0.5; -moz-opacity: 0.5; -khtml-opacity: 0.5; filter: alpha(Opacity=50); }
3、编写HTML代码
<div> <img src="https://www.jb51.net/images/shopping/pro_img/blue_one_small.jpg" alt="" jqimg="/images/shopping/pro_img/blue_one_big.jpg"/> </div>
其中，在HTML代码中添加该插件自定义的jqimg属性，值为大图的文件路径。
4、查看官方网站的API使用说明，可以写出如下JS代码
/*使用jqzoom*/ $(function() { $(".jqzoom").jqueryzoom({ xzoom: 300, //放大图的宽度(默认是 200) yzoom: 300, //放大图的高度(默认是 200) offset: 10, //离原图的距离(默认是 10) position: "right", //放大图的定位(默认是 "right") preload: 1 }); });
附件
附件1：jQuery.jqzoom.js
//************************************************************** // jQZoom allows you to realize a small magnifier window,close // to the image or images on your web page easily. // // jqZoom version 2.2 // Author Doc. Ing. Renzi Marco() // First Release on Dec 05 2007 // i'm looking for a job,pick me up!!! // mail: renzi.mrc@gmail.com //************************************************************** (function($){ $.fn.jqueryzoom = function(options){ var settings = { xzoom: 200, //zoomed width default width yzoom: 200, //zoomed div default width offset: 10, //zoomed div default offset position: "right" ,//zoomed div default position,offset position is to the right of the image lens:1, //zooming lens over the image,by default is 1; preload: 1 }; if(options) { $.extend(settings, options); } var noalt=''; $(this).hover(function(){ var imageLeft = $(this).offset().left; var imageTop = $(this).offset().top; var imageWidth = $(this).children('img').get(0).offsetWidth; var imageHeight = $(this).children('img').get(0).offsetHeight; noalt= $(this).children("img").attr("alt"); var bigimage = $(this).children("img").attr("jqimg"); $(this).children("img").attr("alt",''); if($("div.zoomdiv").get().length == 0){ $(this).after("<div><img src='"https://www.jb51.net/+bigimage+"'/></div>"); $(this).append("<div> </div>"); } if(settings.position == "right"){ if(imageLeft + imageWidth + settings.offset + settings.xzoom > screen.width){ leftpos = imageLeft - settings.offset - settings.xzoom; }else{ leftpos = imageLeft + imageWidth + settings.offset; } }else{ leftpos = imageLeft - settings.xzoom - settings.offset; if(leftpos < 0){ leftpos = imageLeft + imageWidth + settings.offset; } } $("div.zoomdiv").css({ top: imageTop,left: leftpos }); $("div.zoomdiv").width(settings.xzoom); $("div.zoomdiv").height(settings.yzoom); $("div.zoomdiv").show(); if(!settings.lens){ $(this).css('cursor','crosshair'); } $(document.body).mousemove(function(e){ mouse = new MouseEvent(e); /*$("div.jqZoomPup").hide();*/ var bigwidth = $(".bigimg").get(0).offsetWidth; var bigheight = $(".bigimg").get(0).offsetHeight; var scaley ='x'; var scalex= 'y'; if(isNaN(scalex)|isNaN(scaley)){ var scalex = (bigwidth/imageWidth); var scaley = (bigheight/imageHeight); $("div.jqZoomPup").width((settings.xzoom)/scalex ); $("div.jqZoomPup").height((settings.yzoom)/scaley); if(settings.lens){ $("div.jqZoomPup").css('visibility','visible'); } } xpos = mouse.x - $("div.jqZoomPup").width()/2 - imageLeft; ypos = mouse.y - $("div.jqZoomPup").height()/2 - imageTop ; if(settings.lens){ xpos = (mouse.x - $("div.jqZoomPup").width()/2 < imageLeft ) ? 0 : (mouse.x + $("div.jqZoomPup").width()/2 > imageWidth + imageLeft ) ? (imageWidth -$("div.jqZoomPup").width() -2) : xpos; ypos = (mouse.y - $("div.jqZoomPup").height()/2 < imageTop ) ? 0 : (mouse.y + $("div.jqZoomPup").height()/2 > imageHeight + imageTop ) ? (imageHeight - $("div.jqZoomPup").height() -2 ) : ypos; } if(settings.lens){ $("div.jqZoomPup").css({ top: ypos,left: xpos }); } scrolly = ypos; $("div.zoomdiv").get(0).scrollTop = scrolly * scaley; scrollx = xpos; $("div.zoomdiv").get(0).scrollLeft = (scrollx) * scalex ; }); },function(){ $(this).children("img").attr("alt",noalt); $(document.body).unbind("mousemove"); if(settings.lens){ $("div.jqZoomPup").remove(); } $("div.zoomdiv").remove(); }); count = 0; if(settings.preload){ $('body').append("<div>sdsdssdsd</div>"); $(this).each(function(){ var imagetopreload= $(this).children("img").attr("jqimg"); var content = jQuery('div.jqPreload'+count+'').html(); jQuery('div.jqPreload'+count+'').html(content+'<img src=https://www.jb51.net/article/\"'+imagetopreload+'\">'); }); } } })(jQuery); function MouseEvent(e) { this.x = e.pageX; this.y = e.pageY; }
附件2：放大镜图标（zoomlens.gif）
