jquery实现图片放大效果

好久没更新了，先来一发关于jquery图片放大缩小的代码

直接上代码

前端页面：

<tr>    <td height="30" align="right" bgcolor="#f2f2f2" class="left_txt2">产品相册</td>    <td bgcolor="#f2f2f2">&nbsp;</td>    <td width="32%" height="30" bgcolor="#f2f2f2" class="goodsimgupload">        <span id="uploadPercent"></span>        <input type="hidden" value="<?php echo $result['goodsimg'];?>" name="goodsimg" />        <img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="<?php echo $result['goodsimg'];?>" id="img_id" class ="img" width="100" height="50" >    </td></tr>

$(function (){    var isbig = -1;//定义全局变量 判断放大缩小 自己发挥的写吧    $(".img").click(function(){        if(isbig == -1) {            $("#img_id").animate({height: "300px", width: "300px"});            isbig = 1;        }else{            $("#img_id").animate({height: "50px", width: "100px"});            isbig = -1;        }    });});