【indesign图片等比缩放】js图片等比缩放程序代码

更新时间:2017-10-18    来源:js教程    手机版     字体:

【www.bbyears.com--js教程】

 代码如下

<script language="JavaScript">

</script>

实例二

 代码如下 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";
         }
    }
}

在需要实现等比缩放的图片上加上onload语句,图片装载时初始化大小。
具体实现代码如下:

 代码如下

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