通过以下代码即可取出index:
let designer = GC.Spread.Sheets.Designer.findControl(document.querySelector(".gc-designer-container"));
let spread = designer.getWorkbook();
let sheet = spread.getActiveSheet();
var cellType2 = new GC.Spread.Sheets.CellTypes.ComboBox();
cellType2.items(["a","b","c"]);
sheet.getCell(2, 2).cellType(cellType2);
console.log(cellType2.editorValueType());
cellType2.editorValueType(1);
sheet.getValue(2,2);
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