var a = this.getValue();
var location = this.options.location; //获取当前控件的位置
var cr = FR.cellStr2ColumnRow(location);
var col = cr.col; //列号
var ro = cr.row; //行号
var b= contentPane.getCellValue(0,col-1,ro);
if(a>b){contentPane.setCellValue(0,col,ro,b);}