正在播放：1-1开篇知识点框架预览
function check_login(){
//登录弹框
var index = layer.open({
type: 1,
title:'',
closeBtn: 0,
shadeClose: true, //点击遮罩关闭
content: $('.login_layer')
});
$('.login_layer .close').on('click', function(){
layer.close(index)
});
}
function check_quanxian(){
$.MsgBox.Alert("提醒", "年会员及其以上等级会员才有下载的权限
立即升级","","2");
}
function check_quanxian2(){
$.MsgBox.Alert("提醒", "月会员及其以上等级会员才有下载的权限
立即升级","","2");
}
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