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图片预览
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head><title>本地图片预览</title><style type="text/css">#preview{width:100px;height:100px;border:1px solid #000;overflow:hidden;}#imghead {filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);}</style><script type="text/javascript">function previewImage(file){ var MAXWIDTH = 100; var MAXHEIGHT = 100; var div = document.getElementById(‘preview‘); if (file.files && file.files[0]) { div.innerHTML = ‘<img id=imghead>‘; var img = document.getElementById(‘imghead‘); img.onload = function(){ var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); img.width = rect.width; img.height = rect.height; img.style.marginLeft = rect.left+‘px‘; img.style.marginTop = rect.top+‘px‘; } var reader = new FileReader(); reader.onload = function(evt){img.src = http://www.mamicode.com/evt.target.result;}"‘; file.select(); var src = http://www.mamicode.com/document.selection.createRange().text;"<div id=divhead style=‘width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;margin-left:"+rect.left+"px;"+sFilter+src+"\"‘></div>"; }}function clacImgZoomParam( maxWidth, maxHeight, width, height ){ var param = {top:0, left:0, width:width, height:height}; if( width>maxWidth || height>maxHeight ) { rateWidth = width / maxWidth; rateHeight = height / maxHeight; if( rateWidth > rateHeight ) { param.width = maxWidth; param.height = Math.round(height / rateWidth); }else { param.width = Math.round(width / rateHeight); param.height = maxHeight; } } param.left = Math.round((maxWidth - param.width) / 2); param.top = Math.round((maxHeight - param.height) / 2); return param;}</script></head><body><div id="preview"> <img id="imghead" width="100" height="100" border="0" src=http://www.mamicode.com/‘../images/demo.jpg‘>"file" onchange="previewImage(this)" /></body></html>
图片预览
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