小程序上实现tab标签的变化

• 小程序上想要实现成点击标签跳转某标签，在标签内滚动时随着超过滚动内容 tab 选中态变化。
• 借助了 @vant/weapp 框架

index.wxml

    <view class="list-page">
        <van-tabs sticky active="{{ active }}"  bind:click="onHangeActive" bind:scroll="onScrollHeight" >
            <van-tab title="户型 {{house}}"  data-type="house"></van-tab>
            <van-tab title="周边 {{periphery}}" data-type="periphery"></van-tab>
            <van-tab title="详情 {{detail}}"   data-type="detail"></van-tab>
            <van-tab title="留言 {{message}}"data-type="message"></van-tab>
            <view class="house common-box ">
                户型1 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                户型2 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                户型3 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <view></view>
                户型4 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
            </view>
            <view class="periphery common-box">
                周边1 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                周边2 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                周边3 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
            </view>
            <view class="detail common-box">
                详情1 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                详情2 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                详情3 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <view></view>
                详情4 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                详情5 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                详情6 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
            </view>
            <view class="message common-box">
                留言1 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                留言2 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <text>\n</text>
                留言3 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
                <view></view>
                留言4 Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolores quam, beatae totam vel ab quas aut. Aliquid vero alias, ex distinctio sit quos ipsum autem mollitia consectetur sed, repudiandae nobis.
            </view>

        </van-tabs>

    </view>

index.ts

    Page({

        /**
        * 页面的初始数据
        */
        data: {
            active: 0,
            house: "",
            periphery: "",
            detail: "",
            message: "",
            tabList: [
            '户型1',
            '户型1',
            '户型3',
            '户型4'
            ]
        },

        /**
        * 生命周期函数--监听页面加载
        */
        onLoad() {
            wx.setNavigationBarTitle({
                title: '新demo'
            })
            this.onViewHeight('.house', 'house');
            this.onViewHeight('.periphery', 'periphery');
            this.onViewHeight('.detail', 'detail');
            this.onViewHeight('.message', 'message');

        },
        /**
        * 获取区域位置信息
        * @param sel 元素class
        * @param valueKey  绑定top值
        */
        onViewHeight(sel: any, valueKey: any) {
            wx.createSelectorQuery().select(sel).boundingClientRect((res: any) => {
                this.setData({
                    [valueKey]: res.top - 44
                })
            }).exec()
        },
        // 点击切换tab
        onHangeActive(e: any) {
            const { index, } = e.detail;
            this.setData({
                active: index
            })
            const type = index === 0 ? '.house' : index === 1 ? '.periphery' : index === 2 ? '.detail' : '.message';
            // 滚动到指定位置
            // const tmp:any =  this.data.detail
            wx.pageScrollTo({
                selector: type,
                // scrollTop: tmp
                offsetTop: -50,
                duration: 0
            })

        },
        onScrollHeight(e: any) {
            const { scrollTop } = e.detail;
            if(scrollTop) {
                const { active, periphery,detail,message} = this.data;
                let activeTmp = active;
                if(scrollTop < +periphery - 44 ) {
                    activeTmp = 0;
                }else if( scrollTop >= +periphery - 44 && scrollTop < +detail - 44 ) {
                    activeTmp = 1;
                }else if( scrollTop >= +detail - 44 && scrollTop < +message - 44 ) {
                    activeTmp = 2;
                }else if( scrollTop >= +message - 44 ) {
                    activeTmp = 3;
                }
                this.setData({
                    active: activeTmp
                })
            }
        },
        /**
        * 生命周期函数--监听页面初次渲染完成
        */
        onReady() {

        },

        /**
        * 生命周期函数--监听页面显示
        */
        onShow() {

        },

        /**
        * 生命周期函数--监听页面隐藏
        */
        onHide() {

        },

        /**
        * 生命周期函数--监听页面卸载
        */
        onUnload() {

        },

        /**
        * 页面相关事件处理函数--监听用户下拉动作
        */
        onPullDownRefresh() {

        },

        /**
        * 页面上拉触底事件的处理函数
        */
        onReachBottom() {

        },

        /**
        * 用户点击右上角分享
        */
        onShareAppMessage() {

        }
    })

index.wxss

    .common-box {
        padding: 10px;
        box-sizing: border-box;
    }
    .house {
        background-color: aquamarine;

    }
    .periphery {
        background-color: burlywood;
    }
    .detail {
        background-color: cornsilk;
    }
    .message {
        background-color: rgb(152, 141, 224);
        height: 100vh;
    }

index.json

    {
        "navigationBarTitleText": "demo",
        "usingComponents": {
            "van-tab": "@vant/weapp/tab/index",
            "van-tabs": "@vant/weapp/tabs/index"
        }
    }