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Defines the type of the text vertAlign.
example
//This example uses the VertAlign enumeration.
activeSheet.setValue(1, 1, {richText:[{style:{vertAlign:GC.Spread.Sheets.VertAlign.subscript},text:'SpreadJS'}]}, GC.Spread.Sheets.SheetArea.viewport);
• normal = 0
indicate normal text align.
• subscript = 2
indicate subscript.
• superscript = 1
indicate superscript.