<view wx:if="{{alert}}" catchtouchmove="myCatchTouch">
     <template is="alert" data="{{alertData}}" />
</view>

myCatchTouch: function () {
    console.log('stop user scroll it!');
    return;
},

<view class="{{showModalView?'tripList_root':''}}">

.tripList_root{
    top:0px;
    left: 0px;
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: fixed;
    z-index: 0;
}