js实现图片实时预览

注: 此博客转自 http://www.cnblogs.com/goody9807/p/6064582.html  转载请注明出处

 

<body>
    上传图片:   <input type="file" name="file"
                   style="width: 200px; height: 20px;" onchange="PreviewImage(this)" id="upload" />
    <div id="imgPreview" style="width:120px; height:100px;margin-left: 280px;">
    </div>
</body>
</html>
<script type="text/javascript">
    function PreviewImage(imgFile) {
        var filextension = imgFile.value.substring(imgFile.value.lastIndexOf("."), imgFile.value.length);
        filextension = filextension.toLowerCase();
        if ((filextension != '.jpg') && (filextension != '.gif')  && (filextension != '.jpeg') && (filextension != '.png') && (filextension != '.bmp')) {
            alert("对不起，系统仅支持标准格式的照片，请您调整格式后重新上传，谢谢 !");
            imgFile.focus();
        }
        else {
            var path;
            if (document.all)//IE
            {
                imgFile.select();
                path = document.selection.createRange().text;
  
                document.getElementById("imgPreview").innerHTML = "";
                document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src=\"" + path + "\")";//使用滤镜效果
            }
            else//FF
            {
                path = window.URL.createObjectURL(imgFile.files[0]);
                document.getElementById("imgPreview").innerHTML = "<img id='img1' width='120px' height='100px' src='" + path + "'/>";
                // document.getElementById("img1").src = path;
            }
        }
    }
</script>

 

posted @ 2016-12-01 17:14  戈丫汝  阅读(435)  评论(0)  编辑  收藏  举报