实现图片上传预览效果

<!DOCTYPE html>
<html>

    <head>
        <meta charset="utf-8">
        <title></title>
    </head>
    <script type="text/javascript" src="jquery-1.10.2.min.js"></script>

    <body>
        <input type="file" onchange="previewFile()">
        <br>
        <img src="" height="200" alt="Image preview...">
    </body>
    <script type="text/javascript">
        function previewFile() {
            var preview = document.querySelector('img');
            var file = document.querySelector('input[type=file]').files[0];
            var reader = new FileReader();
            reader.onloadend = function() {
                preview.src = reader.result;
            }
            if (file) {
                reader.readAsDataURL(file);
            } else {
                preview.src = "";
            }
        }
    </script>

</html>
实现图片上传预览效果

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