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js 控制图片大小核心讲解
简介缩放图片脚本分享 复制代码 代码如下: New D</div>
<div class="news_infos"><div id="MyContent">缩放图片脚本分享 <BR><U>复制代码</U> 代码如下: <BR><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <BR><html> <BR><head> <BR><title> New Document </title> <BR><meta name="Generator" content="EditPlus"> <BR><meta name="Author" content=""> <BR><meta name="Keywords" content=""> <BR><meta name="Description" content=""> <br><br><script> <br><br>function AutoResizeImage(maxWidth,maxHeight){ <BR>var objImg = document.getElementById("operImg"); <BR>var img = new Image(); <BR>img.src = objImg.src; <BR>var hRatio; <BR>var wRatio; <BR>var Ratio = 1; <BR>var w = img.width; <BR>var h = img.height; <BR>wRatio = maxWidth / w; <BR>hRatio = maxHeight / h; <BR>if (maxWidth ==0 && maxHeight==0){ <BR>Ratio = 1; <BR>}else if (maxWidth==0){// <BR>if (hRatio<1) Ratio = hRatio; <BR>}else if (maxHeight==0){ <BR>if (wRatio<1) Ratio = wRatio; <BR>}else if (wRatio<1 || hRatio<1){ <BR>Ratio = (wRatio<=hRatio?wRatio:hRatio); <BR>} <BR>if (Ratio<1){ <BR>w = w * Ratio; <BR>h = h * Ratio; <BR>} <BR>objImg.height = h; <BR>objImg.width = w; <BR>} <BR></script> <br><br></head> <br><br><body> <br><br><img src="/UploadFiles/2021-04-02/1111.jpg"><br><input type="button" value="缩放至宽100px，等比例压缩" onclick="AutoResizeImage(100,0)"/> <br><br><input type="button" value="缩放至300px，等比例压缩" onclick="AutoResizeImage(300,0)"/> <br><br><input type="button" value="原图" onclick="AutoResizeImage(0,0)"/> <BR></body> <BR></html> <BR> <BR>重点js: <BR><U>复制代码</U> 代码如下: <BR>function AutoResizeImage(maxWidth,maxHeight){ <BR>var objImg = document.getElementById("operImg"); <BR>var img = new Image(); <BR>img.src = objImg.src; <BR>var hRatio; <BR>var wRatio; <BR>var Ratio = 1; <BR>var w = img.width; <BR>var h = img.height; <BR>wRatio = maxWidth / w; <BR>hRatio = maxHeight / h; <BR>if (maxWidth ==0 && maxHeight==0){ <BR>Ratio = 1; <BR>}else if (maxWidth==0){// <BR>if (hRatio<1) Ratio = hRatio; <BR>}else if (maxHeight==0){ <BR>if (wRatio<1) Ratio = wRatio; <BR>}else if (wRatio<1 || hRatio<1){ <BR>Ratio = (wRatio<=hRatio?wRatio:hRatio); <BR>} <BR>if (Ratio<1){ <BR>w = w * Ratio; <BR>h = h * Ratio; <BR>} <BR>objImg.height = h; <BR>objImg.width = w; <BR>} <BR></div>
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