备忘(图片的等比例缩放)

14年前
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";            }       }   }
html部分
<img src="图片url" onload="javascript:resizeimg(this,500,600);"  />
网上抄来的东西,写上以免留在电脑中忘记了存放的地方(只支持ie内核的浏览器)