wx.setStorageSync数组类型存不了吗

Creator 2.x
#1

public userInfo: IUserInfo = {
energy：0，
arrlockAD:[],
}
interface IUserInfo {
energy: number,
arrlockAD：Array
}

执行
userInfo.energy = 5
userInfo.arrlockAD.push(1)
wx.setStorageSync(“XXX”, userInfo);

let _userInfo = wx.getStorageSync(“XXX”);
_userInfo.energy = 5
_userInfo.arrlockAD = []
数组的数据没存下来 数组是要咋存