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导入导出后列宽等参数失效

问题：fromJSON后无法修改列宽参数

背景：

用户的具体操作如下

1. 将列宽设置为0

2. toJSON序列化成一个tmp变量

3. fromJSON反序列化tmp变量

结果：想要调整列宽，setColumnWidth()无效

let tmpJSON=null;
let sheet=spread.getActiveSheet();
sheet.setColumnWidth(0,0);
tmpJSON=sheet.toJSON();
setTimeout(
    function(){
        sheet.fromJSON(tmpJSON);
    },1000)

解决方案：

造成上述无法调整列宽的原因是，fromJSON后原本的sheet对象已经被销毁了，此时拿到的sheet对象已经不再是原本之前的sheet对象了，因此需要再重新获取sheet对象之后再设置列宽才能生效，如下所示：

let tmpJSON=null;
let sheet=spread.getActiveSheet();
sheet.setColumnWidth(0,0);
tmpJSON=sheet.toJSON();
setTimeout(
    function(){
        sheet.fromJSON(tmpJSON);
    },1000)
let sheet2 = spread.getActiveSheet();
sheet2.setColumnWidth(0,10);

通过上述示例，可以知道sheet.fromJSON()后，sheet对象发生了变化。建议重新获取一下，然后再用sheet.setColumnWidth(0,0)设置列宽。

作者: Grapecity.China | 审核：Clark.Pan | 更新时间：2023.12.28