有一个表格
<form method="post" action="pixels.php" enctype="multipart/form-data">
<input type="file" name="graphic" style=" font-size:14px;" value="data:image/png;base64,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"><br>
<input type="submit" value="Upload">
</form>我正在尝试将图像 ( base64) 附加到input，base64是从另一个绘图员通过 获取的localstorage，从那里结果证明它仅设置为value。
按照计划，应该是这样的，画图，转到另一个页面，onload从localstorage那里插入到input，点击下载时应该会选择文件（jpg）。