JS to determine whether the field is empty isNull (not original)

In JS, the IF condition is null/undefined/0/nan/"" expression, all are interpreted as false, and all are true.//null Judgment function IsNull (arg1) {return!arg1 && Arg1!==0 && typeof arg1!== "boolean"? True:false;} Alert (IsNull (null));    True//alert (IsNull ("));      True//alert (IsNull ());       True//var aa={};          Alert (IsNull (AA.A));   True//alert (isNull (0));        False//alert (IsNull (' 0 '));    False//alert (IsNull (true));   False//alert (IsNull ("undefined"));  False//alert (isNull (undefined));     True//alert (IsNull ([]));       False//alert (IsNull ({}));       

　　

JS to determine whether the field is empty isNull (not original)