本文实例为大家分享了微信小程序实现吸顶效果的具体代码，供大家参考，具体内容如下
吸顶效果思路：
1.首先获取 Tab 栏与顶部的距离；
2.监听页面滚动事件 onPageScroll，判断 Tab 栏是否滚动到顶部；
3.当 Tab 栏滚动到顶部时，添加吸顶样式，实现效果。
Page({
data: {
navbarInitTop: 0, //导航栏初始化距顶部的距离
isFixedTop: false, //是否固定顶部
},
onLoad: function(options) {
},
onShow: function() {
var that = this;
if (that.data.navbarInitTop == 0) {
//获取节点距离顶部的距离
wx.createSelectorQuery().select('#navbar').boundingClientRect(function(rect) {
if (rect && rect.top > 0) {
var navbarInitTop = parseInt(rect.top);
that.setData({
navbarInitTop: navbarInitTop
});
}
}).exec();
}
},
onPageScroll: function(e) {
var that = this;
var scrollTop = parseInt(e.scrollTop); //滚动条距离顶部高度
//判断'滚动条'滚动的距离 和 '元素在初始时'距顶部的距离进行判断
var isSatisfy = scrollTop >= that.data.navbarInitTop ? true : false;
// 只有处于吸顶的临界值才会不相等
if (that.data.isFixedTop === isSatisfy) {
return false;
}
that.setData({
isFixedTop: isSatisfy
});
}
})代码部分
<view style="width: 90%; height: 300rpx; background: #f0f0f0; margin: 30rpx auto;"></view>
<view style="width: 90%; height: 300rpx; background: #f0f0f0; margin: 30rpx auto;"></view>
<view class="navbar-wrap">
<view class="column {{isFixedTop?'fixed':''}}" id="navbar">
<view class="block active">新品推荐</view>
<view class="block">限时优惠</view>
<view class="block">火爆热搜</view>
<view class="block">猜你喜欢</view>
</view>
<!-- 用于吸顶后 占位用的 -->
<view class="column" wx:if="{{isFixedTop}}"></view>
</view>
<block wx:for="{{20}}" wx:key="list">
<view style="width: 100%; height: 120rpx; background: #f0f0f0; margin: 20rpx auto;"></view>
</block>页面样式：
view, text {
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
}
.navbar-wrap {
width: 100%;
}
.navbar-wrap .column {
width: 100%;
height: 80rpx;
display: flex;
flex-direction: row;
align-items: center;
justify-content: space-around;
background: #fff;
border-bottom: solid 1px #eee;
top: 0;
left: 0;
z-index: 100;
}
.navbar-wrap .column.fixed {
position: fixed;
}
.navbar-wrap .column .block {
width: 25%;
height: 80rpx;
line-height: 80rpx;
text-align: center;
font-size: 30rpx;
color: #333;
letter-spacing: 1px;
position: relative;
}
.navbar-wrap .column .block::after {
content: "";
width: 60%;
height: 3px;
border-radius: 2px;
position: absolute;
bottom: 0;
left: 50%;
transform: translateX(-50%);
background: transparent;
}
.navbar-wrap .column .block.active {
color: #1490ce;
font-weight: bold;
}
.navbar-wrap .column .block.active::after {
background: linear-gradient(160deg, rgba(8, 220, 230, 0.7) 10%, rgba(0, 140, 255, 0.7) 90%);
}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
