解决小程序点击弹出模态框，子父级都有滚动条问题

var app = getApp()

Page({
  data: {
    isScroll: true,
    showView:false,
    winHeight:0
  },
  onLoad:function(options){
    showView: (options.showView == "true" ? true : false);
    var that = this;
    //  高度自适应
    wx.getSystemInfo({
      success: function (res) {
        var clientHeight = res.windowHeight,
          clientWidth = res.windowWidth,
          rpxR = 750 / clientWidth;
        console.log(clientHeight)
        var calc = clientHeight * rpxR-100;
        console.log(calc)
        that.setData({
          winHeight: calc
        });
      }
    })
  },
  showModel:function (e) {
    this.setData({
      showView:true,
      isScroll:false,
    })
  },
  cancel:function(){
    this.setData({
      showView: false,
      isScroll: true,
    })
  }
})

//css文件
::-webkit-scrollbar{
  width: 0;
  height: 0;
  color: transparent;
}
.hide{
  display: none
}
.show{
  display: block;
}
scroll-view{
  width:100%;
  height:100%;
}
#cientWill{
  position: fixed;
  width: 750rpx;
  height: 100vh;
  overflow: auto;
  padding: 0 20rpx;
  top: 0;
  left: 0;
  background:#fff;
  z-index: 999;
}

　　

<view class="cusEdit">
 <scroll-view scroll-y="true"  style="height:{{winHeight}}rpx">  

     <view  class="form-group first">
             <ul class="basicMsg">
                <li data-type="text" class="">
                    <view class="li-inner ">
                        <span class="k">姓名</span> <span class="v"><input name="custName" placeholder="请输入姓名" type="text" ></input></span>
                    </view>
                </li>
                <li data-type="text" class="">
                    <view class="li-inner ">
                        <span class="k">意向级别</span> <span class="v"><button name="custName" placeholder="请选择" type="text" bindtap='showModel'>请选择</button></span>
                    </view>
                </li>
            </ul>
     </view>
 </scroll-view>  
//这个是子级内容
 <scroll-view>  
    <view id='cientWill' class="hide{{showView?'show':''}}">
    </view>
 </scroll-view>
</view>

　　

贴出主要代码，

思考步骤：
1.使用<scroll-view>作为根节点包裹所有view，并动态绑定scroll-view的scroll-y属性<scroll-view scroll-y="{{isScroll}}">，自定义它的高度，var calc = clientHeight * rpxR-100; “-100”是因为我底部有选项卡，你若不需要就不永用减；
2.点击button按钮触发showModel事件，子级内容显示，更改isScroll的值为false，关闭弹窗的点击事件中，更改isScroll的值为true