.l-btn-disabled {filter: grayscale(100%); -webkit-filter: grayscale(100%); -moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);opcacity:0.5;}
对于ie11，暂时没有找到较好的兼容方法
