自定义单元格类型getHitInfo问题

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CustomHearderCellType.prototype.getHitInfo = function ( x, y, cellStyle, cellRect, context ) {
let rowCount = context.sheet.getRowCount();
var hitInfo = {
      x: x,
      y: y,
      row: context.row,
      col: context.col,
      cellRect: cellRect,
      sheetArea: context.sheetArea,
      sheet: context.sheet,
      rowCount: rowCount
};
console.log(hitInfo.col, 'getHitInfo');
return hitInfo;
};
CustomHearderCellType.prototype.processMouseDown = function(hitInfo){
hitInfo.sheet.endEdit(true);
console.log(hitInfo.col,'processMouseDown');
hitInfo.mouseDownCol = hitInfo.col;
}
CustomHearderCellType.prototype.processMouseUp = function (hitInfo) {
console.log(hitInfo.col, 'processMouseUp');
// if(hitInfo.mouseDownCol === hitInfo.col){
//    console.log('click');
// }else{
//    console.log('move');
// }
};

鼠标在col=3落下--》鼠标移动至col=4--〉鼠标抬起hitinfo.col竟然=3？？？不应该是4么？