<html>
<head><title>上传按钮样式优化</title><style>
.form-element-file-wapper { position: relative; width: 100px; height: 32px; overflow: hidden; margin: 0 auto;}.form-element-file-wapper button {
width: 100px; height: 32px; background-color: #38ADFF; color: #fff;}.form-element-file-wapper input[type=file] {
position: absolute; top: 0; left: 0; width: 100px; height: 32px; opacity: 0; cursor: pointer; font-size: 500px;}</style>
</head>
<body><div class="form-element-file-wapper">
<button type="button">上传照片</button> <input type="file" accept="image/jpeg,image/png,image/gif"></div> </body></html>
<!--
总结：
1.<div class="form-element-file-wapper">作为父元素 style="position: relative;"
2.<input type="file" />置为不可见。 style="position: absolute;" 让元素漂在<button></button>元素上面。用户点击其实就点击这元素。
3.<button type="button">上传照片</button> 作为显示按钮，显示给用户看。
-->