How to specify multiple conditions in an ‘if’ statement in JavaScript [closed]

Just add them within the main bracket of the if statement like:

if ((Type == 2 && PageCount == 0) || (Type == 2 && PageCount == '')) {
    PageCount = document.getElementById('<%=hfPageCount.ClientID %>').value;
}

Logically, this can be rewritten in a better way too! This has exactly the same meaning:

if (Type == 2 && (PageCount == 0 || PageCount == '')) {