function main(spreadsheetReport) {
var writeBack = spreadsheetReport.spreadsheetReportWriteBack;
writeBack.removeListener(writeBack.elem_btnSave, "click", writeBack.doSaveClick, writeBack);
writeBack.addListener(writeBack.elem_btnSave, "click",
function(e) {
// 定义字段及其对应的单元格位置
var fields = [
{ position: "A3", name: "项目名称" },
{ position: "B3", name: "项目一级类别" },
{ position: "C3", name: "项目二级类别" },
{ position: "D3", name: "业主单位" },
{ position: "E3", name: "预计合同额（万元）" },
{ position: "F3", name: "目前进展" },
{ position: "G3", name: "预计签约日期" }
];
var hasEmptyField = false; // 标记是否找到空字段
var firstEmptyFieldName = ""; // 存储第一个空字段的名称
// 循环校验每个字段
for (var i = 0; i < fields.length; i++) {
var cellList = spreadsheetReport.getExpandedPositions(fields.position);
for (var j = 0; j < cellList.length; j++) {
var cell = spreadsheetReport.getCell(cellList[j]);
if (!cell.innerText) {
if (!hasEmptyField) { // 只提示第一个找到的空字段
hasEmptyField = true;
firstEmptyFieldName = fields.name;
alert(firstEmptyFieldName + " 不能为空！");
}
return; // 找到空字段后，立即停止执行
}
}
}
if (!hasEmptyField) {
this.doSaveClick(e); // 所有字段都不为空时，执行保存操作
}
},
writeBack);
}
这个代码应该怎么修改？ | 
