var tmp = this.pullDown.getValue();
if(!tmp && typeof(tmp)!="undefined" && tmp!=0){ //判断null
var alertDate = 0;
}else{
var alertDate = this.pullDown.getValue().val;
};
var tmp = this.pullDown.getValue();
if(!tmp && typeof(tmp)!="undefined" && tmp!=0){ //判断null
var alertDate = 0;
}else{
var alertDate = this.pullDown.getValue().val;
};