js上传图片获取base64及预览的功能

<!DOCTYPE html>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
        <style type="text/css">
            #preview,
            .img,
            img {
                width: 200px;
                height: 200px;
            }
            
            #preview {
                border: 1px solid #000;
            }
        </style>
    </head>

    <body>
        <div id="preview"></div>
        <input type="file" onchange="preview(this)" />
        <script type="text/javascript">
            function preview(file) {
                var prevDiv = document.getElementById('preview');
                if(file.files && file.files[0]) {
                    var reader = new FileReader();
                    reader.onload = function(evt) {
                        prevDiv.innerHTML = '<img src="' + evt.target.result + '" />';
                    }
                    reader.readAsDataURL(file.files[0]);
                } else {
                    prevDiv.innerHTML = '<div class="img" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src=\'' + file.value + '\'"></div>';
                }
            }
        </script>
    </body>

</html>
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