使用绝对定位和opacity实现：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>File Upload with Image Preview</title>
<style>
.file-upload {
position: relative;
width: 200px; /* 自定义文件上传框的宽度 */
height: 200px; /* 自定义文件上传框的高度 */
overflow: hidden;
}
.file-upload input[type=file] {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
opacity: 0;
cursor: pointer;
}
.file-upload img {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="file-upload" id="fileUpload">
<input type="file" id="upload" accept="image/*">
<img src="//repo.bfw.wiki/bfwrepo/image/60dc6fc6c2145.png" alt="点击上传">
</div>
</body>
</html>
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