html5表格图片按比例缩放 JS图片等比例缩放方法完整示例

本文实例讲述了JS图片等比例缩放方法。分享给大家供大家参考，具体如下：

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javascript自动按比例显示图片，按比例压缩图片显示

function AutoResizeImage(maxWidth,maxHeight,objImg){

var img = new Image();

img.src = objImg.src;

var hRatio;

var wRatio;

var Ratio = 1;

var w = img.width;

var h = img.height;

wRatio = maxWidth / w;

hRatio = maxHeight / h;

if (maxWidth ==0 && maxHeight==0){

Ratio = 1;

}else if (maxWidth==0){//

if (hRatio<1) Ratio = hRatio;

}else if (maxHeight==0){

if (wRatio<1) Ratio = wRatio;

}else if (wRatio<1 || hRatio<1){

Ratio = (wRatio<=hRatio?wRatio:hRatio);

}

if (Ratio<1){

w = w * Ratio;

h = h * Ratio;

}

objImg.height = h;

objImg.width = w;

}

border="0"

width="0"

height="0"

οnlοad="AutoResizeImage(100,0,this)"

/>

width:100px

border="0"

width="0"

height="0"

οnlοad="AutoResizeImage(0,100,this)"

/>

height:100px

border="0"

width="0"

height="0"

οnlοad="AutoResizeImage(100,100,this)"

/>

width:100px height:100px

希望本文所述对大家JavaScript程序设计有所帮助。