Javascript限制頁(yè)面圖片大小

    Javascript限制頁(yè)面圖片大小，具體代碼如下：
    function limitImage(ImgD){
    var areaWidth = 300; //你放置圖片區(qū)域的寬度。
    var areaHeight = 300; //你放置圖片區(qū)域的高度。
    var image=new Image();
    image.src=ImgD.src;
    if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= areaWidth/areaHeight){
    if(image.width>areaWidth){
    ImgD.width=areaWidth;
    ImgD.height=(image.height*areaWidth)/image.width;
    }else{
    ImgD.width=image.width;
    ImgD.height=image.height;
    }
    ImgD.alt=image.width+"×"+image.height;
    }else{
    if(image.height>areaHeight){
    ImgD.height=areaHeight;
    ImgD.width=(image.width*areaHeight)/image.height;
    }else{
    ImgD.width=image.width;
    ImgD.height=image.height;
    }
    ImgD.alt=image.width+"×"+image.height;
    }
    }
    }