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input按钮上传按钮样式

主要是定位和不透明度来实现:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        /*a  upload */
        .a-upload {
            padding: 4px 10px;
            height: 20px;
            line-height: 20px;
            position: relative;
            cursor: pointer;
            color: #888;
            background: #fafafa;
            border: 1px solid #ddd;
            border-radius: 4px;
            overflow: hidden;
            display: inline-block;
            *display: inline;
            *zoom: 1
        }

        .a-upload  input {
            position: absolute;
            font-size: 100px;
            right: 0;
            top: 0;
            opacity: 0;
            filter: alpha(opacity=0);
            cursor: pointer
        }

        .a-upload:hover {
            color: #444;
            background: #eee;
            border-color: #ccc;
            text-decoration: none
        }

        .file {
            position: relative;
            display: inline-block;
            background: #D0EEFF;
            border: 1px solid #99D3F5;
            border-radius: 4px;
            padding: 4px 12px;
            overflow: hidden;
            color: #1E88C7;
            text-decoration: none;
            text-indent: 0;
            line-height: 20px;
        }
        .file input {
            position: absolute;
            font-size: 100px;
            right: 0;
            top: 0;
            opacity: 0;
        }
        .file:hover {
            background: #AADFFD;
            border-color: #78C3F3;
            color: #004974;
            text-decoration: none;
        }
    </style>
</head>
<body>
<a href="javascript:;" class="a-upload">
    <input type="file" name="">点击这里上传文件
</a>

<a href="javascript:;" class="file">选择文件
    <input type="file" name="">
</a>
</body>
</html>

 

input按钮上传按钮样式