java 脚本中 for 循环中的迭代器错误(在 filereader 中使用 onload 函数)

Error with iterator in for loop in java script(With onload function in filereader)

代码:

    var workbook = XLSX.read(data, {type: 'binary'});
    var first_sheet_name = workbook.SheetNames[0];
    var worksheet = workbook.Sheets[first_sheet_name];
    var k=1
    var desired_cell = worksheet['A'+k].w;

以上代码运行良好 但是:

       for (var i = 1; i <= 50; i++) {
        var obj = {};
        var cell = (worksheet[('A'+i)]).w;
        obj.PickUpDate = cell;
        obj.PickUpTimeSlot = cell;
        obj.PickUpAddress = cell;
        obj.DeliveryAddress = cell;
        obj.BoxType = cell;
        array.push(obj);
    }

这段代码报错:

Uncaught TypeError: Cannot read property 'w' of undefined
at FileReader.reader.onload 

行:

var cell = (worksheet[('A'+i)]).w;

很好,因为我可以将 'cell' 打印到控制台。 两个片段都在 FileReader.reader.onload 函数中。 我正在使用 xlsx 包 https://github.com/SheetJS/js-xlsx

该代码有什么问题?

来自 SheetJS/js-xlsx 文档:

Built-in export utilities (such as the CSV exporter) will use the w text if it is available. To change a value, be sure to delete cell.w (or set it to undefined) before attempting to export. The utilities will regenerate the w text from the number format (cell.z) and the raw value if possible.

您无法确定 (worksheet[('A'+i)]).w 是否已定义。

我不知道你的工作表数据是什么,但也许可以完成这项工作:

var cell = (typeof (worksheet[('A'+i)]).w !== 'undefined') ? worksheet[('A'+i)]).w : worksheet[('A'+i)]).v;

希望对您有所帮助。