鼠标滚动实现图片放大缩小[转]

来源:互联网 发布:设计师软件 编辑:程序博客网 时间:2024/04/29 02:09

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<SCRIPT LANGUAGE="JavaScript">
<!--
//图片按比例缩放,可输入参数设定初始大小
function resizeimg(ImgD,iwidth,iheight) {
     var image=new Image();
     image.src=ImgD.src;
     if(image.width>0 && image.height>0){
        if(image.width/image.height>= iwidth/iheight){
           if(image.width>iwidth){
               ImgD.width=iwidth;
               ImgD.height=(image.height*iwidth)/image.width;
           }else{
                  ImgD.width=image.width;
                  ImgD.height=image.height;
                }
               ImgD.alt=image.width+"×"+image.height;
        }
        else{
                if(image.height>iheight){
                       ImgD.height=iheight;
                       ImgD.width=(image.width*iheight)/image.height;
                }else{
                        ImgD.width=image.width;
                        ImgD.height=image.height;
                     }
                ImgD.alt=image.width+"×"+image.height;
        }
    ImgD.style.cursor= "pointer"; //改变鼠标指针
        ImgD.onclick = function() { window.open(this.src);} //点击打开大图片
        if (navigator.userAgent.toLowerCase().indexOf("ie") > -1) { //判断浏览器,如果是IE
      ImgD.title = "请使用鼠标滚轮缩放图片,点击图片可在新窗口打开";
      ImgD.onmousewheel = function img_zoom() //滚轮缩放
      {
          var zoom = parseInt(this.style.zoom, 10) || 100;
          zoom += event.wheelDelta / 12;
          if (zoom> 0) this.style.zoom = zoom + "%";
          return false;
      }
    } else { //如果不是IE
            ImgD.title = "点击图片可在新窗口打开";
         }
    }
}

//-->
</SCRIPT>
</head>

<body>

<div >
<img name="" src="new.jpg" onload="javascript:resizeimg(this,198,235)">
<div>
</body>
</html>

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