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js实现图片上传及预览---------------------->>兼容ie6-8 火狐以及谷歌

  

<head runat="server">    <title>图片上传及预览(兼容ie6/7/8 firefox/chrome)</title>    <script src="../Scripts/jquery-1.4.2.min.js" type="text/javascript"></script></head><body>    <form id="form1" runat="server">    <div>        <div>            <asp:FileUpload ID="fileAppImg" runat="server" Style="font-size: 13px;" onchange="previewImage(this,‘preview‘,‘appImg‘)" /></div>        <div id="preview" style="margin-top: 10px;">            <img id="appImg" src="../SourceImg/ContentPage/AccountAuth/zjyl.jpg" alt="" style="margin-left: 1px;                height: 214px; width: 160px;" />        </div>    </div>    </form></body></html><%--图片上传预览--%><script type="text/javascript">    //图片上传预览    function previewImage(file, div, img) {        MAXWIDTH = 160;        MAXHEIGHT = 214;        var div = document.getElementById(div);        if (file.files && file.files[0]) {            //验证图片大小            var imgType = /\.[^\.]+$/.exec(file.value);            if (imgType != ".jpg" && imgType != ".png") {                alert("仅支持jpg和png两种格式的图片");                file.value = "";                $("#txtShowIcon").val("未选中文件");                return;            }            div.innerHTML = "<img id=‘" + img + "‘>";            var img = document.getElementById(img);            img.onload = function () {                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);                img.width = rect.width;                img.height = rect.height;                img.style.marginLeft = rect.left + px;                img.style.marginTop = rect.top + px;            }            var reader = new FileReader();            reader.onload = function (evt) { img.src = evt.target.result; }            reader.readAsDataURL(file.files[0]);        }        else {            //验证图片大小            var imgType = /\.[^\.]+$/.exec(file.value);            if (imgType != ".jpg" && imgType != ".png") {                alert("仅支持jpg和png两种格式的图片");                return;            }            var filePath = file.value;            //IE浏览器            var sFilter = filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="http://www.mamicode.com/;            file.select();            var src = document.selection.createRange().text;            div.innerHTML = <img id=" + img + ">;            var img = document.getElementById(img);            //img.filters.item(‘DXImageTransform.Microsoft.AlphaImageLoader‘).src = http://www.mamicode.com/src;            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);            status = (rect: + rect.top + , + rect.left + , + rect.width + , + rect.height);            div.innerHTML = "<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 };        param.width = maxWidth;        param.height = maxHeight;        param.left = 0;        param.top = 0;        return param;    }</script>

 

js实现图片上传及预览---------------------->>兼容ie6-8 火狐以及谷歌