# Function: onBackpackItemCountChange

▸ onBackpackItemCountChange(handler: BackpackItemCountChangeEventHandler): void

注册背包物品数量更新事件处理函数

example

import { backpackSystem } from '@timi/mogs-sdk';

backpackSystem.onBackpackItemCountChange((event) => {
  switch (event.type) {
    case backpackSystem.BackpackItemCountChangeEventType.Increase:
      console.log(event.itemId, event.itemUid, event.backpackId, event.position);
      console.log('物品数量增加前后的值：', event.previousValue, event.currentValue);
      console.log('是否为新增的物品：', event.previousValue.equals(0));
      break;
    case backpackSystem.BackpackItemCountChangeEventType.Decrease:
      console.log(event.itemId, event.itemUid, event.backpackId, event.position);
      console.log('物品数量减少前后的值：', event.previousValue, event.currentValue);
      console.log('是否为删除但物品：', event.currentValue.equals(0));
      break;
  }
});

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# 参数:

属性	类型
`handler`	BackpackItemCountChangeEventHandler

# 返回值:

void

← offBackpackRefresh onBackpackItemCustomDataUpdate →