小程序实现锚点滑动效果

要在小程序中实现锚点的话，就要用到<scroll-view > 标签中的，scroll-into-view，详情可见文档

wxml：

<view class='scroll-box' style='height:{{ht}}px;'>
 <scroll-view scroll-y class='menu-tab' scroll-into-view="{{toView}}" scroll-with-animation="true">
 <block wx:for="{{tabList}}" wx:key="">
  <view class='item-tab {{item.checked ? "item-act":""}}' id="t{{index}}" data-index="{{index}}" bindtap='intoTab'>{{item.title}}</view>
 </block>
 </scroll-view>

 <scroll-view scroll-y style='height:{{ht}}px;'
 scroll-with-animation="true"
 bindscrolltoupper="upper"
 bindscrolltolower="lower"
 bindscroll="scrollRight"
 scroll-into-view="{{toViewRt}}">
 <block wx:for="{{contList}}" wx:key="">
  <view class='cont-box' id="t{{index}}" style='height:{{ht}}px;'>{{item.cont}}</view>
 </block>
 </scroll-view>
</view>

wxss:

.scroll-box{display: flex;flex-wrap: nowrap;}
.menu-tab{
 width: 180rpx;
 text-align: center;
 height: 100%;
 color: #666;
 border-right:1rpx solid #999

}
.item-tab{
 font-size:28rpx;
 padding:8rpx;
}
.cont-box{
 border-top: 1px solid;
 box-sizing: border-box;
}
.item-act{
 background: linear-gradient(to bottom right, #6C53B1 , #8B2EDF);
 color: #fff;
 border-radius: 100px;
}

js:

var app = getApp();

Page({
 data: {
 current: 0,
 // 左侧菜单
 tabList: [
  { title: 'tab1', checked: true },
  { title: 'tab2', checked: false },
  { title: 'tab3', checked: false },
  { title: 'tab4', checked: false },
  { title: 'tab5', checked: false },
  { title: 'tab6', checked: false },

 ],
 // 右侧内容
 contList: [
  { cont: 'tab1'},
  { cont: 'tab2'},
  { cont: 'tab3'},
  { cont: 'tab4'},
  { cont: 'tab5'},
  { cont: 'tab6'},

 ],
 },

 // 循环切换
 forTab(index) {
 let lens = this.data.tabList.length;
 let _id = 't' + index;
 for (let i = 0; i < lens; i++) {
  this.data.tabList[i]['checked'] = false;
 }
 this.data.tabList[index]['checked'] = true;
 this.setData({
  tabList: this.data.tabList,
  toView: _id,
  current: index
 });
 },

 // 点击左侧菜单栏
 intoTab(e) {
 let lens = this.data.tabList.length;
 let _index = e.currentTarget.dataset.index;
 this.forTab(_index);
 let _id = 't' + _index;
 this.setData({
  toViewRt: _id
 });
 },

 // 滚动右侧菜单
 scrollRight(e) {
 //console.log(e)
 let _top = e.detail.scrollTop;
 let progress = parseInt(_top / this.data.ht); // 计算出 当前的下标
 if (progress > this.data.current) { // 向上拉动屏幕

  this.setData({ current: progress });
  this.forTab(this.data.current);
 } else if (progress == this.data.current) {
  return false;
 } else { // 向下拉动屏幕

  this.setData({
  current: progress == 0 ? 0 : progress--
  });
  this.forTab(progress);
 }
 },

 onLoad: function (options) {
 console.log(this.data.tabList)
 // 框架尺寸设置
 wx.getSystemInfo({
  success: (options) => {
  var wd = options.screenWidth; // 页面宽度
  var ht = options.windowHeight; // 页面高度
  this.setData({ wd: wd, ht: ht })
  }
 });
 },

 onShow: function () {
 // 初始化状态
 this.setData({
  toView: 't' + this.data.current,
  toViewRt: 't' + this.data.current
 })
 }, 

})

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