本文实例讲述了javascript实现获取图片大小及图片等比缩放的方法。分享给大家供大家参考，具体如下：

获取图片大小：

var originImage = new Image(); function GetImageWidth(oImage) { if (originImage.src != oImage.src) originImage.src = oImage.src; return originImage.width; } function GetImageHeight(oImage) { if (originImage.src != oImage.src) originImage.src = oImage.src; return originImage.height; }

图片等比缩放：

function SetImage(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; } } } }

希望本文所述对大家JavaScript程序设计有所帮助。