控件
CSS修改控件样式-https://help.fanruan.com/finereport/doc-view-1367.html
JS实现改变控件透明度-https://help.fanruan.com/finereport/doc-view-3312.html
https://bbs.fanruan.com/thread-134333-1-1.html
【表单JS实例】JS实现控件融入背景