小程序如何自定义索引菜单

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<view class="indexes_chunk" wx:for="{{brandIndexList.brandGroupList}}" wx:key="item">     <view class="letter ancehor-{{item.indexLetter}}">{{item.indexLetter}}</view>     <view class="choice" wx:for="{{item.brandList}}" wx:for-item="items" wx:key="items" wx:for-index="cindex">          <text class="text actives">{{items.enName}}{{items.cnName}}</text>          <text class="iconfont icon-Gouxuan"></text>   </view></view>

主要代码：

function throttle(fn, interval) {    var enterTime = 0;//触发的时间    var gapTime = interval || 300 ;//间隔时间，如果interval不传，则默认300ms    return function() {      var context = this;      var backTime = new Date();//第一次函数return即触发的时间      if (backTime - enterTime > gapTime) {        fn.call(context,arguments);        enterTime = backTime;//赋值给第一次触发的时间，这样就保存了第二次触发的时间      }    };};data:{      brandIndexList:{            brandGroupList:[                {                    brandList:[                        {brandId:1, cnName: "爱马仕A", enName: "Hermes", indexLetter: "A"}                    ],                    indexLetter: "A"                },                {                    brandList:[                        {brandId:2, cnName: "爱马仕B", enName: "Hermesss", indexLetter: "B"}                    ],                    indexLetter: "B"                },                {                    brandList:[                        {brandId:3, cnName: "爱马仕G", enName: "Hermes", indexLetter: "G"}                    ],                    indexLetter: "G"                },                {                    brandList:[                        {brandId:4, cnName: "爱马仕M", enName: "Hermesss", indexLetter: "M"}                    ],                    indexLetter: "M"                },                {                    brandList:[                        {brandId:5, cnName: "爱马仕P", enName: "Hermesss", indexLetter: "P"}                    ],                    indexLetter: "P"                },                {                    brandList:[                        {brandId:6, cnName: "爱马仕V", enName: "Hermesss", indexLetter: "V"}                    ],                    indexLetter: "V"                }            ],            indexLetterList: ["A", "B", "G", "M", "P", "V"]        }，   letternodes:[],//索引菜单 全部节点位置   letterIndex:0,}  onReady(){             let self = this;        let indexLetterList = self.data.brandIndexList.indexLetterList,            letterNodes = self.data.letterNodes,            nodes = '.ancehor-',            arrs = [];            // 获取所有索引锚点节点            indexLetterList.forEach((item)=>{                arrs.push(nodes+item);                if(arrs.length == indexLetterList.length){                    self.getDoms(arrs.join(','),(res)=>{                        letterNodes = res.map((item)=>{return item.top-88});                        self.setData({                            letterNodes:letterNodes                        });                    });                    wx.hideLoading();                }            });    },    // 动态获取节点     getDoms(node,success){        let self = this,            query = wx.createSelectorQuery();            setTimeout(()=>{                query.selectAll(node).boundinGClientRect((res)=>{                    success && success(res);                }).exec()            },1000);    },     // 索引菜单点击滚动    letterClick(e){        let self = this,            index = e.currentTarget.dataset.index,            letterNodes = self.data.letterNodes;            wx.pageScrollTo({                scrollTop: letterNodes[index]            })    },     // 页面滚动    onPageScroll:throttle(function(e){     let self = this,         scrollTop = e[0].scrollTop,         stickyTop = self.data.stickyTop,         letterNodes = self.data.letterNodes,         showSticky = self.data.showSticky,         letterIndex = self.data.letterIndex;        // 显示右侧索引        if(scrollTop>=stickyTop){            showSticky = true;        }else{            showSticky = false;        }        //滚动定位索引        letterNodes.forEach((item,index)=>{            if(scrollTop>=item){                letterIndex = index;                // console.log(index)            }        })              // console.log(scrollTop)        self.setData({            showSticky:showSticky,            letterIndex:letterIndex        });    },10)

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