jquery实现图片点击放大，点击任意地方图片缩小。电脑/手机都适用!!! 首先引入jqury包
<script type="text/javascript" src="/public/weui/jquery-2.1.4.js"></script>html代码
<td width="350"><img height="100" class="pimg" width="100" src="__PUBLIC__/img/1.jpg" /><img height="100" class="pimg" width="100" src="__PUBLIC__/img/2.jpg" /><img height="100" class="pimg" width="100" src="__PUBLIC__/img/3.jpg" />
</td><!-- 测试图片放大 --><div id="outerdiv" style="position:fixed;top:0;left:0;background:rgba(0,0,0,0.7);z-index:2;width:100%;height:100%;display:none;"><div id="innerdiv" style="position:absolute;"><img id="bigimg" style="border:5px solid #fff;" src="" /></div></div>js代码
<script>$(function(){$(".pimg").click(function(){alert();});});function imgShow(outerdiv, innerdiv, bigimg, _this){var src = _this.attr("src");//获取当前点击的pimg元素中的src属性$(bigimg).attr("src", src);//设置#bigimg元素的src属性/*获取当前点击图片的真实大小，并显示弹出层及大图*/$("<img/>").attr("src", src).load(function(){var windowW = $(window).width();//获取当前窗口宽度var windowH = $(window).height();//获取当前窗口高度var realWidth = this.width;//获取图片真实宽度var realHeight = this.height;//获取图片真实高度var imgWidth, imgHeight;var scale = 0.8;//缩放尺寸，当图片真实宽度和高度大于窗口宽度和高度时进行缩放if(realHeight>windowH*scale) {//判断图片高度imgHeight = windowH*scale;//如大于窗口高度，图片高度进行缩放imgWidth = imgHeight/realHeight*realWidth;//等比例缩放宽度if(imgWidth>windowW*scale) {//如宽度扔大于窗口宽度imgWidth = windowW*scale;//再对宽度进行缩放}} else if(realWidth>windowW*scale) {//如图片高度合适，判断图片宽度imgWidth = windowW*scale;//如大于窗口宽度，图片宽度进行缩放imgHeight = imgWidth/realWidth*realHeight;//等比例缩放高度} else {//如果图片真实高度和宽度都符合要求，高宽不变imgWidth = realWidth;imgHeight = realHeight;}$(bigimg).css("width",imgWidth);//以最终的宽度对图片缩放var w = (windowW-imgWidth)/2;//计算图片与窗口左边距var h = (windowH-imgHeight)/2;//计算图片与窗口上边距$(innerdiv).css({"top":h, "left":w});//设置#innerdiv的top和left属性$(outerdiv).fadeIn("fast");//淡入显示#outerdiv及.pimg});$(outerdiv).click(function(){//再次点击淡出消失弹出层$(this).fadeOut("fast");});}
</script>