JS控制图片等比例缩放的示例代码_javascript技巧

 代码如下:

function DrawImage(ImgD,FitWidth,FitHeight){
var image=new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0){
if(image.width/image.height>= FitWidth/FitHeight){
if(image.width>FitWidth){
ImgD.width=FitWidth;
ImgD.height=(image.height*FitWidth)/image.width;
}
else{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
else{
if(image.height>FitHeight){
ImgD.height=FitHeight;
ImgD.width=(image.width*FitHeight)/image.height;
}
else{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}

调用方法：
代码如下:
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