[]关于下拉列表的选择触发

this.small_map.selectHandler = new Laya.Handler(this, onSelect_small);
this.big_map.selectHandler = new Laya.Handler(this, onSelect_big);

function onSelect_small(e) {
Laya.big_switch = 0
Laya.maptype = "small"
this.now_map.text = "当前地图：" + this.small_map.selectedLabel
Laya.map_small_c = e
}

function onSelect_big(e) {
if (e != 0) {
if (Laya.keys > 0) {
Laya.big_switch = 0
Laya.map_big = e
Laya.maptype = "big"
this.small_map.selectedIndex = 0
this.now_map.text = "当前地图：" + this.big_map.selectedLabel
} else {
var dia1 = new loading()
dia1.confirm.label = "大秘境钥匙不足"
dia1.loading_desc.text = "可在小秘境挂机获取"
dia1.confirm.on(Laya.Event.MOUSE_UP, this, dai1, [dia1])
dia1.popup()
// this.big_map.selectedIndex = 0
}
}
}


两个列表，手动选择会触发，没有问题，但如果在下面加一个修改下拉数据的
this.small_map.labels = “1，2，3”
上面function onSelect_small(e) 自动也执行了，如何才能，只修改数据，不执行触发？