微信小程序商品选择点击取消

let clickAgain = that.data.clickAgain;//data里定义的一个变量
if (clickAgain == e.currentTarget.dataset.index){
if (that.data.clickId == -1){
that.setData({
clickId: e.currentTarget.dataset.index
});
}else{
that.setData({
clickId: -1
});
} 
}else{
that.setData({
clickAgain: e.currentTarget.dataset.index,
clickId: e.currentTarget.dataset.index
});

}