我的脚本在执行时很慢。 请告诉我是什么让这个脚本提供结果很慢

Question

Purpose of this script is when i populate Column B cells, Today's date should be populated in column A (only if it is empty). using FOR loop for inserting multiple dates when changing multiples column B cells. I could not bale to identify what makes this script slower. it takes 10 to 15 secs for auto date population. please tweak this to be faster..

//------------------------------------------------------------
//Auto-Populate date in Column A of when column B is updated 
//------------------------------------------------------------
function onEdit(event) {
  var eventRange = event.range;
  if (eventRange.getColumn() == 2) { // 2 == column B
    
    // getRange(row, column, numRows, numColumns)
    var columnXRange = SpreadsheetApp.getActiveSheet().getRange(eventRange.getRow(), 1, eventRange.getNumRows(), 1);

    var values = columnXRange.getValues();
    
    if (values.length == 1) {        // if active cell is 1, quickly insert date without loop
      values[0][0] = new Date();
    }
    else {
      for (var i = 0; i < values.length; i++) {       
        if (!values[i][0]) {         // If cell isn't empty
          values[i][0] = new Date();
          //values.clearContent();
        }
        
      }     
    }
    columnXRange.setValues(values);  
  }
}

Answer 1

function onEdit(e) {
  e.source.toast('Entry');
  if (e.range.columnStart == 2) { 
    var columnXRange = e.range.getSheet().getRange(e.range.rowStart,1,e.range.rowEnd-e.range.rowStart + 1,1);
    var values = columnXRange.getValues();
    if (values.length==1) {
      values[0][0]=new Date();
     }else {
      for (var i=0;i<values.length;i++) {       
        if (!values[i][0]) {
          values[i][0] = new Date();
        }
      }     
    }
    columnXRange.setValues(values);  
  }
}

Answer 2

Since you don't need all the date information being different at each cell, then I would call the Date function once, and store it in a variable for use later. This should speed up your code.

Example:

//------------------------------------------------------------
//Auto-Populate date in Column A of when column B is updated 
//------------------------------------------------------------
function onEdit(event) {
  var eventRange = event.range;
  if (eventRange.getColumn() == 2) { // 2 == column B
    
    // getRange(row, column, numRows, numColumns)
    var columnXRange = SpreadsheetApp.getActiveSheet().getRange(eventRange.getRow(), 1, eventRange.getNumRows(), 1);

    var values = columnXRange.getValues();
    /* Call Date() just once */
    var date = new Date();
    date = date.toString().split(' ').splice(0,4).join(' ');

    if (values.length == 1) {        // if active cell is 1, quickly insert date without loop
      values[0][0] = date;
    }
    else {
      for (var i = 0; i < values.length; i++) {       
        if (!values[i][0]) {         // If cell isn't empty
          values[i][0] = date;
        }
        
      }     
    }
    columnXRange.setValues(values);  
  }
}