如何清除单元格的所有的边框

trace

上图里的所有边框，我改怎么清除？
我代码里是这么写的，但是没有效果，望指点：
let GC = window.GC;
var lineBorder = new GC.Spread.Sheets.LineBorder(this.selectedColor, this.selectedBorderLine);
var sheetArea = GC.Spread.Sheets.SheetArea.viewport;let sheet = this.ctrlSpread.getActiveSheet();let selections = this.ctrlSpread.getActiveSheet().getSelections();let selection = selections[0];
let rowCount = selection.rowCount;
let colCount = selection.colCount;
let range = sheet.getRange(selection.row, selection.col, rowCount, colCount,GC.Spread.Sheets.SheetArea.viewport);

let borderObj = {
   all:false,
   left: false,
   right: false,
   top: false,
   bottom: false,
   diagonalUp:false,
   diagonalDown:false,
   outline:false,
   inside:false,
   innerHorizontal:false,
   innerVertical:false};
range.setBorder(lineBorder, borderObj, sheetArea);

trace · trace

你可以这样
let borderObj = {
   all:true,
   left: true,
   right: true,
   top: true,
   bottom: true,
   diagonalUp:true,
   diagonalDown:true,
   outline:true,
   inside:true,
   innerHorizontal:true,
   innerVertical:true};

sheet.getRange(0, 0, 2, 2, GC.Spread.Sheets.SheetArea.viewport).setBorder(null, borderObj );
把那个range变成你自己的就行