Html5上传后有所见图片效果前端代码实现

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>上传一下看看</title>
</head>
<body>
<form action="__SELF__" method="post" onsubmit="return checkfilefun()">
    <input type="file" id="pic" name="pic[]" multiple="multiple">
    <input type="submit" value=" 提交查看信息 ">
</form>
<img src="" alt="" id="previewImage">
<script>
    function checkfilefun() {
        var files = document.querySelector('#pic').files;

        for (var i = 0, f; f = files[i]; i++) {
            if (!f.type.match('image.*')) {
                continue;
            }
            var reader = new FileReader();
            reader.onload = (function (theFile) {
                return function (e) {
                    document.getElementById('previewImage').src = e.target.result;
                };
            })(f);
            reader.readAsDataURL(f);
        }

        return false;
    }
</script>
</body>
</html>