兼容ie[6-9]、火狐、Chrome、opera、maxthon3、360浏览器的js本地图片预览

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<head>

<title></title>

</head>

<body>

<div id="divPreview">

      <img id="imgHeadPhoto" src="noperson.jpg" style="width: 160px; height: 170px; border: solid 1px #d2e2e2;" alt="" />

</div>

<input type="file" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')" size="20"/>

<script type="text/javascript">

//js本地图片预览,兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3

function PreviewImage(fileObj,imgPreviewId,divPreviewId){

    var allowExtention=".jpg,.bmp,.gif,.png";//允许上传文件的后缀名document.getElementById("hfAllowPicSuffix").value;

    var extention=fileObj.value.substring(fileObj.value.lastIndexOf(".")+1).toLowerCase();            

    var browserVersion= window.navigator.userAgent.toUpperCase();

    if(allowExtention.indexOf(extention)>-1){

        if(fileObj.files){//HTML5实现预览,兼容chrome、火狐7+等

            if(window.FileReader){

                var reader = new FileReader();

                reader.onload = function(e){

                    document.getElementById(imgPreviewId).setAttribute("src",e.target.result);

                }  

                reader.readAsDataURL(fileObj.files[0]);

            }else if(browserVersion.indexOf("SAFARI")>-1){

                alert("不支持Safari6.0以下浏览器的图片预览!");

            }

        }else if (browserVersion.indexOf("MSIE")>-1){

            if(browserVersion.indexOf("MSIE 6")>-1){//ie6

                document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);

            }else{//ie[7-9]

                fileObj.select();

                if(browserVersion.indexOf("MSIE 9")>-1)

                    fileObj.blur();//不加上document.selection.createRange().text在ie9会拒绝访问

                var newPreview =document.getElementById(divPreviewId+"New");

                if(newPreview==null){

                    newPreview =document.createElement("div");

                    newPreview.setAttribute("id",divPreviewId+"New");

                    newPreview.style.width = document.getElementById(imgPreviewId).width+"px";

                    newPreview.style.height = document.getElementById(imgPreviewId).height+"px";

                    newPreview.style.border="solid 1px #d2e2e2";

                }

                newPreview.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";                            

                var tempDivPreview=document.getElementById(divPreviewId);

                tempDivPreview.parentNode.insertBefore(newPreview,tempDivPreview);

                tempDivPreview.style.display="none";                    

            }

        }else if(browserVersion.indexOf("FIREFOX")>-1){//firefox

            var firefoxVersion= parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);

            if(firefoxVersion<7){//firefox7以下版本

                document.getElementById(imgPreviewId).setAttribute("src",fileObj.files[0].getAsDataURL());

            }else{//firefox7.0+                    

                document.getElementById(imgPreviewId).setAttribute("src",window.URL.createObjectURL(fileObj.files[0]));

            }

        }else{

            document.getElementById(imgPreviewId).setAttribute("src",fileObj.value);

        }         

    }else{

        alert("仅支持"+allowExtention+"为后缀名的文件!");

        fileObj.value="";//清空选中文件

        if(browserVersion.indexOf("MSIE")>-1){                        

            fileObj.select();

            document.selection.clear();

        }                

        fileObj.outerHTML=fileObj.outerHTML;

    }

}

</script>

</body>

</html>

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