var a = _g().getCellValue("B4",null);
if(a.length==0){
FR.Msg.alert("用户未登录,请返回刷新后重新进入","");
}else{
}
10版本移动端报错:CustomJSError: undefined is not an ob ject(evaluating 'a. length')
把B4改成0,1,3
https://blog.csdn.net/zico_a/article/details/107150639