js scales images in equal proportions. This function is very practical. When a web page loads a relatively large image, it often deforms the web page and makes the page ugly. So we thought of using JS to control the image beyond a certain range. pictures to stabilize the page layout. This code snippet completes this function, and the code is very concise and the effect is very good.
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<head>
<title>等比例缩放图片</title>
<script>
function DrawImage(ImgD,iwidth,iheight){
//参数(图片,允许的宽度,允许的高度)
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;
}
}else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}
</script>
</head>
<body>
<img src=http://up.2cto.com/2013/0803/20130803034531502.jpg" alt="自动缩放后的效果" width="100" height="100" onload="javascript：DrawImage(this,80,80)" />
</body>
</html>
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