fix bug

apps/classroom/Tpl/default/Index/theme_x7_w3g.html

@@ -246,17 +246,7 @@
 			},
 			onDownload: function (title, path) {
 				if ( path ) {
-					var link = document.createElement('a');
-					// 设置下载的文件名
-					link.download = title;
-					link.style.display = 'none';
-					//设置下载路径
-					link.href = path;
-					//触发点击
-					document.body.appendChild(link);
-					link.click();
-					//移除节点
-					document.body.removeChild(link);
+					window.location.href = path;
 					this.close_yulan();
 				} else {
 					alert('当前课程无文件下载');