随机子串错误？ “TypeError：在对象中找不到函数子字符串......”

Question

错误是：

TypeError：在对象中找不到函数子字符串

代码循环遍历 10 个值，检查第一个字符是否为数字。

function TypeErrorMystery() {

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var s = ss.getActiveSheet();

  //loop from cell 1-10
  for (var i = 0; i < 10; i++) {
    var range = s.getRange(i + 1, 1)
    var substring1 = range.getValue().substring(0, 1);
      //if first character in cell is #
      if (substring1 === "#" ) {
         //write over it with "success"
         range.setValue("success");
      }
   };
}

确切的错误是：

TypeError：在对象 3 中找不到函数子字符串。（第 9 行，文件“代码”），

第 9 行在哪里：

var substring1 = range.getValue().substring(0, 1);

Answer 1

单元格中的值是数字 3。substring() 方法在应用于数字时会引发错误。您应该检查返回的值的类型。

if (typeof thisCellValue === 'number') {continue;};//Skip over numbers

完整代码：

function TypeErrorMystery() {

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var s = ss.getActiveSheet();
  var range,
      substring1,
      thisCellValue;

  //loop from cell 1-10
  for (var i = 0; i < 10; i++) {
    range = s.getRange(i + 1, 1)
    thisCellValue = range.getValue();
    Logger.log('typeof thisCellValue: ' + typeof thisCellValue);

    if (typeof thisCellValue === 'number') {continue;};

    substring1 = thisCellValue.substring(0, 1);

    //if first character in cell is #
    if (substring1 === "#" ) {
      //write over it with "success"
      range.setValue("success");
    }
  };
};