小程序 - tab左右切换效果

分析

1、设置data-current属性用于：点击当前项时，通过点击事件swichNav中处理e.dataset.current取到点击的目标值。

2、swiper组件的current组件用于控制当前显示哪一页

3、swiper组件绑定change事件switchTab，通过e.detail.current拿到当前页

wxml:
<view class="record-box">
    <view class="nav">
        <scroll-view scroll-x="true" class="navbar-box" srcoll-left="{{navScrollLeft}}"
            srcoll-width-animation="{{true}}">
            <block wx:for="{{recordMain}}" wx:for-index="idx" wx:for-item="navItem" wx:key="idx">
                <view class="nav-item {{currentTab == idx ? 'text' : ''}}" data-current="{{idx}}" 
                    bindtap="switchNav">
                    <label>{{navItem.text}}</label>
                </view>
            </block>
        </scroll-view>
    </view>
</view>
---------------------------------------------------------------------------------------------
<view class="record-ft">
    <swiper class="tab-box" current="{{currentTab}}" duration="300" bindchange="switchTab">
        <swiper-item wx:for="{{[0,1,2,3]}}" wx:for-item="tabItem" wx:for-index="idx" wx:key="idx"
             class="tab-cnetent">
                <block wx:for="{{tabContent}}" wx:for-item="tabItem" wx:key=" ">
                    <view class="padding-box" bindtap="navigateUrl" data-url="/pages/index/index">
                        <view class="weui-list-box weui-main">
                            <view class="weui-list-bd">
                                <view class="img-box">
                                    <image src="{{tabItem}}" class="img" mode="widthFix"></image>
                                </view>
                            </view>
                            <view class="weui-list-ft">
                                <view class="weui-title">
                                    <view class="text-flow clamp-xs font-sm">{{tabItem.title}}</view>
                                    <view class="text">
                                        <laber>{{tabItem.text}}</laber>
                                        <laber>{{tabItem.text}}</laber>
                                    </view>
                                </view>
                                <view class="weui-cost">
                                    <view>￥<laber>{{tanItem.cost}}</laber></view>
                                </view>
                            </view>
                        </view>
                    </view>
                </block>
        </swiper-item>
    </swiper>
</view>

JS
Page ({
    const app = getApp()
    data: {
        recordMian: [
            {
                title: "插画艺术"
            },
            {
                title: "工艺作品"
            },
            {
                title: "服装艺术"
            },
            {
                title: "三维建模"
            },
        ],
        tabContent: [
            {
              title: "台灯卧室床头 简约现代书房 北欧宜家创意装饰个性圆球台灯床头灯",
              text: "台灯",
              cost: "1255",
              imgUrl: "http://img.weiye.me/zcimgdir/album/file_59b8f7b66ba7f.jpg",
            },
            {
              title: "雪域冰雪天地8寸牛乳芝士蛋糕",
              text: "蛋糕",
              cost: "15",
              imgUrl: "http://img.weiye.me/zcimgdir/album/file_59b8f7b66ba7f.jpg",
            },
        ],
        currentTab: 0,
        navScrollLeft: 0
    },
    // 事件处理函数
    onLoad: function() {
        if (app.globalData.userInfo) {
            this.setData({
                userInfo: app.globalData.userInfo,
                hasUserInfo: true
            })
         }  else if (this.data.canIUse) {
                app.userInfoReadyCallback = res => {
                    this.setData({
                        userInfo: res.userInfo,
                        hasUserInfo: true
                    })
                }
            }
        }else {
            wx.getUserInfo({
                success: res => {
                    app.globalData.userInfo = res.userInfo
                    this.setData({
                        userInfo: res.userInfo,
                        hasUserInfo: true
                    })
                }
            })
        }
        wx.getSystemInfo({
            success: (res) => {
                this.setData({
                    pixelRatio: res.pixelRatio,
                    windowHeight: res.windowHeight,
                    windowWidth: res.windowWidth
                })
            }
        })
    },
    // 滑动事件
    // 点击标题切换当前页时改变样式
    switchNav(event) {
        var cur = event.currentTarget.dataset.current;
        if (this.data.currentTab == cur) {
            return false;
        } else {
            this.setData({
                currentTab: cur
            })
        }
    },
    // 滚动切换标签样式 
    switchTab(event) {
        var cur = evnet.detail.current;
        var singeNavWidth = this.data.windowWidth / 5;
        this.setData({
            currentTab: cur,
            navScrollLeft: (cur - 2) * singleNavWidth
        });
    }
})