微信小程序如何实现美团菜单

本文实例为大家分享了微信小程序实现美团菜单的具体代码，供大家参考，具体内容如下

问题：我设置菜品高度的单位是rpx，而scrollTop的单位是px，这也就是说，上面我计算的x是个变量， 所以当改变测试机型，这个功能就失效了。。。请教各位有什么好的方法没？

onLoad(e) {
 let goodsList = this.data.goodsList;
 // 初始化每项菜品距离顶部的距离
 for (let i = 0; i < goodsList.length; i++) {
 if (i != 0)
 goodsList[i].scrollTop = parseInt(goodsList[i - 1].scrollTop) + parseInt((goodsList[i - 1].goods.length * 90) + 35)
 }
 this.data.goodsList = goodsList;
},
// 右侧滚动事件
onGoodsScroll: function (e) {
 let that = this;
 // 当前滚动部分距离页面顶部距离
 let scrollTop = parseInt(e.detail.scrollTop);
 let goodsList = that.data.goodsList;
 for (let i = 0; i < goodsList.length; i++) {
 let currentScrollTop = goodsList[i].scrollTop;
 let nextScrollTop = 0;
 if ((i + 1) == goodsList.length)
 nextScrollTop = goodsList[i].scrollTop;
 else
 nextScrollTop = goodsList[i + 1].scrollTop;

 if (currentScrollTop < scrollTop && scrollTop < nextScrollTop) {
 that.setData({
 classifyIdLeft: goodsList[i].id,
 classifySeleted: goodsList[i].id
 })
 }
 }
}

关于上面提到的问题2，解决方法如下，但是具体参数没搞明白怎么回事，而且定位也不是很准，请求各位有什么好方法。

// 右侧滚动事件
 onGoodsScroll: function (e) {
 let that = this;
 let scale = e.detail.scrollWidth / 600;
 let scrollTop = e.detail.scrollTop / scale;
 let h = 0;
 let classifySeleted;
 let len = that.data.goodsList.length;

 that.data.goodsList.forEach(function (classify, i) {
 var _h = 70 + classify.goods.length * 180;
 if (scrollTop >= h - 100 / scale) {
 classifySeleted = classify.id;
 }
 h += _h;
 });
 that.setData({
 classifySeleted: classifySeleted,
 classifyIdLeft: classifySeleted,
 })
 },

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