原生上传文件按钮样式优化

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//解决思路，原生上传文件按钮设置成完全透明，然后定位放大到需要的按钮上，让他全覆盖上去 //这是用了kindeditor后生成的新控件，所以直接找.upload-input1   <a href="" class="pre_btn pre_btn_change">更换照片<input class="upload-input upload-input1" type="file" id="uploadify" capture="camera" /></a>     .pre_btn_change {     position:relative; }     .pre_btn_change .upload-input1 {         opacity: 0;         position: absolute;         top: 0;         left: 0;         bottom: 0;         right: 0;         width: 100%;         height: 100%;     }     .pre_btn_change input.ke-upload-file {         opacity: 0;         position: absolute;         top: 0;         left: 0;         bottom: 0;         right: 0;         width: 100%;         height: 100%;     }