图片放大功能如何做？jquery实现

.zoomify-dialog-pic {
     position: fixed;
     top: 0;
     bottom: 0;
     left: 0;
     right: 0;
     background: rgba(0,0,0,0.35);
     z-index: 99999;
     display: none;
}

.zoomify-dialog-pic .dialog-body {
     
      position:absolute;
      width: 100%;
      max-width: 250px;
      max-height: 300px;
      margin-top:-150px;/*div 高度的一半*/
      margin-left:-125px;/*div 宽度的一半*/
      top:50%;
      left:50%;
      padding:10px;
      border-radius:5px;
      background: white;
}
     
.zoomify-dialog-pic .dialog-body img {
     width: 100%;
}

.magnifier {
  cursor: -moz-zoom-out;
  cursor: -webkit-zoom-out;
  cursor: zoom-out;
  cursor:url(‘icon/magnifier.ico‘),auto;
}

.un-magnifier {
  cursor: -moz-zoom-in;
  cursor: -webkit-zoom-in;
  cursor: zoom-in;
  cursor:url(‘icon/unmagnifier.ico‘),auto;
}

var ROOT = $("input[name=‘globalPath‘]").val();

function zoomOut(orginImg,times){
    
    var obj=$(".zoomify-dialog-pic .dialog-body");
    var img=$(".zoomify-dialog-pic .dialog-body img");

    var imgW=$(orginImg).width();
    var imgH=$(orginImg).height();

    var newH=imgH*times;
    var newW=imgW*times;
    
    var bodyH=$("body").height();
    var bodyW=$("body").width();
    
    if(newW>bodyW){
        newW=bodyW-40;
        obj.css("padding","5px");
    }
    
    if(newH>bodyH){
        newH=bodyH-40;
        obj.css("padding","5px");
    }
    
    //图片新高度、宽度
    img.css("width",newW+"px");
    img.css("height",newH+"px");
    
    //容器新高度、宽度,因为图片放大了，所以容器也必须放大
    //不要用 padding 属性，ie 下不支持
    var padding=parseInt(obj.css("padding-top"));
    
    cWith=newW+padding*2;
    cHeight=newH+padding*2;
    
    obj.css("max-width",cWith+"px");
    obj.css("max-height",cHeight+"px");
    
    obj.css("margin-left",(cWith/2)*-1+"px");
    obj.css("margin-top",(cHeight/2)*-1+"px");
}

function insertPic(url){
    html=‘<div class="zoomify-dialog-pic">‘+
        ‘<div class="dialog-body">‘+
            ‘<img src="‘+url+‘" class="un-magnifier">‘+
        ‘</div>‘+
    ‘</div>‘;
    return html;
}

$(".page-content-l").on(‘click‘,‘p img‘,function(){

    var url=$(this).attr(‘src‘);
    html=insertPic(url);
    $("body").append(html);
    
    zoomOut(this,1.2);
    $(".zoomify-dialog-pic").show();
});

$("html").on(‘click‘,‘.zoomify-dialog-pic‘,function(){
    $(this).remove();
});

$(".page-content-l").on("mouseover mouseout","p img",function(event){
    if(event.type == "mouseover"){
        $(this).addClass("magnifier");
    }else if(event.type == "mouseout"){
        $(this).removeClass("magnifier");
    }
});