微信小程序實現列表分頁功能
微信小程序列表分頁功能（未使用API），供大傢參考，具體內容如下
概述
主要實現功能：
1.列表展示
2.上下頁點擊
效果圖：
知識點：wx:for、bindtap、生命周期函數–監聽頁面加載、.filter、取餘（ % ）取整（parseInt(x/y) ）函數
js
data: {
frontPage: false,//上一頁 存在true，不存在false
nextPage: false,//下一頁 存在true，不存在false
pages: 0,//所有頁
thisPages: 0,//當前頁
rows: 6,//每頁條數
total: 0,//總條數
pageData: [],//本頁顯示的列表數據
prizeListItem:[
{name: "張三", pic: "../../images/1.png", gift:"小蛋糕"},
{name: "李四", pic: "../../images/2.png", gift:"冰淇淋"},
{name: "陳工", pic: "../../images/3.png", gift:"按摩椅"},
{name: "孫悟空", pic: "../../images/3.png", gift:"桃子"},
{name: "豬八戒", pic: "../../images/2.png", gift:"紅燒肉"},
{name: "薩赫尚", pic: "../../images/1.png", gift:"新衣服"},
{name: "程序員", pic: "../../images/2.png", gift:"電腦"},
{name: "甄姬", pic: "../../images/3.png", gift:"口紅"},
{name: "孫悟空", pic: "../../images/3.png", gift:"桃子"},
{name: "豬八戒", pic: "../../images/2.png", gift:"紅燒肉"},
{name: "薩赫尚", pic: "../../images/1.png", gift:"新衣服"},
{name: "程序員", pic: "../../images/1.png", gift:"電腦"},
{name: "甄姬", pic: "../../images/2.png", gift:"口紅"}
],
myPrize: false,
tab1: '',
tab2: 'selected',
},
/**
* 生命周期函數--監聽頁面加載
*/
onLoad: function () {
this.setList();
},
// 初始化列表分頁
setList() {
let that = this;
let thisPages = that.data.thisPages;
let rows = that.data.rows;
let prizeListItem = that.data.prizeListItem;
let pageData = that.data.pageData;
let pages = that.data.pages;
if (pageData !== []){
pageData = prizeListItem.filter(function (item, index, prizeListItem) {
//元素值，元素的索引，原數組。
return index >= rows*thisPages && index <= rows*(thisPages+1)-1; //初始為0，0 < index < 6-1
});
let x = 0;
let y = prizeListItem.length;
if ( y%rows !== 0){
x = 1
};
pages = parseInt(y/rows) + x; //所有頁
thisPages = thisPages +1; //當前頁
if ( pages > 1){
that.setData({
nextPage: true,
})
}
that.setData({
thisPages: thisPages,
pageData: pageData,
pages: pages,
rows: rows,
})
}
},
//點擊下一頁
clickNext() {
let that = this;
let thisPages = that.data.thisPages;
let prizeListItem = that.data.prizeListItem;
let pageData = that.data.pageData;
let pages = that.data.pages;
let rows = that.data.rows;
pageData = prizeListItem.filter(function (item, index, prizeListItem) {
//元素值，元素的索引，原數組。
return index >= rows*thisPages && index <= rows*(thisPages+1)-1;
});
thisPages = thisPages + 1;
if ( pages === thisPages){
that.setData({
nextPage: false,
})
}
that.setData({
thisPages: thisPages,
pageData: pageData,
frontPage: true,
})
},
//點擊上一頁
clickFront() {
let that = this;
let thisPages = that.data.thisPages;
let prizeListItem = that.data.prizeListItem;
let pageData = that.data.pageData;
let rows = that.data.rows;
pageData = prizeListItem.filter(function (item, index, prizeListItem) {
//元素值，元素的索引，原數組。
return index >= rows*(thisPages-2) && index <= rows*(thisPages-1)-1;
});
thisPages = thisPages - 1;
if ( thisPages === 1){
that.setData({
frontPage: false,
})
}
that.setData({
thisPages: thisPages,
pageData: pageData,
nextPage: true,
})
},
wxml
<view class="prizelist">
<view class="info_con">
<view class="list" wx:for="{{pageData}}">
<image class="list_bg" src="../../images/wi_listbg.png"></image>
<view class="list_head">
<image class="list_headpic" src="{{item.pic}}"></image>
<view class="list_name">{{item.name}}</view>
</view>
<view class="list_prize">{{item.gift}}</view>
</view>
</view>
<view class="paging">
<view class="page_btn">
<view wx:if="{{frontPage}}" bindtap="clickFront">上一頁</view>
</view>
<view class="page_num">第{{thisPages}}頁 共{{pages}}頁</view>
<view class="page_btn">
<view wx:if="{{nextPage}}" bindtap="clickNext">下一頁</view>
</view>
</view>
</view>
wxss
【外框
.con .prizelist{
width: 100%;
height: max-content;
margin-top: 38rpx;
}
.con .prizelist .info_con{
width: 639rpx;
height: 787rpx;
display: inline-block;
}
【list的樣式
.con .prizelist .info_con .list{
width: 639rpx;
height: 108rpx;
position: relative;
margin: 20rpx 0;
}
.list .wi_prize{
width: 186rpx;
height: 69rpx;
margin: 20rpx 0 0 60rpx;
}
.list .prizeinfo{
width: 350rpx;
height: 108rpx;
float: right;
}
.list .prizeinfo .prize_name{
font-size: 28rpx;
color: #87562e;
line-height: 42rpx;
margin-top: 20rpx;
}
.list .prizeinfo .prize_state{
font-size: 20rpx;
color: #ff2d2d;
line-height: 25rpx;
}
.list .list_bg{
width: 639rpx;
height: 108rpx;
position: absolute;
left: 56rpx;
z-index: -1;
}
.list .list_head{
height: 100%;
width: max-content;
margin-left: 100rpx;
float: left;
}
.list .list_head .list_headpic{
border-radius: 50%;
background-color: rgb(43, 93, 216);
width: 46rpx;
height: 46rpx;
margin: 31rpx 0rpx;
float: left;
}
.list .list_head .list_name{
color: #000;
line-height: 108rpx;
font-size: 28rpx;
float: left;
margin-left: 31rpx;
}
.list .list_prize{
height: 100%;
line-height: 108rpx;
font-size: 28rpx;
color: #87562e;
float: right;
}
【上下頁樣式
.con .prizelist .paging{
width: 580rpx;
height: 108rpx;
margin: 30rpx auto;
}
.con .prizelist .paging .page_btn{
width: 96rpx;
height: 32rpx;
font-size: 32rpx;
font-family: "PingFangSC";
color: #ffffff;
line-height: 36rpx;
float: left;
margin: auto 23rpx;
}
.con .prizelist .page_num{
font-size: 24rpx;
font-family: "PingFangSC";
color: #ffffff;
line-height: 36rpx;
float: left;
margin: auto 75rpx;
}
結語
有一個可有可無的警告：
Now you can provide attr wx:key for a wx:for to improve performance.
解決辦法：添加wx:key屬性，
①使用循環的 array 中 item 的某個property，比如 wx:key=“item.id”
此時數組的格式應為：
{id: "1", name: "張三", pic: "../../images/1.png", gift:"小蛋糕"},
②使用數組的下標，即 wx:key=“index”
③ wx:key="*this" 我沒太看懂，是
官方文檔說的有一個經歷過的低級錯誤：
錯誤：
onLoad: function () {
setList();
},
改正：
onLoad: function () {
this.setList();
},
（我都沒眼看瞭，馬虎或則腦子不清楚的錯誤總是次次能碰到——2021年3月9日）
後續
1.被指出 “第 X 頁 共 X 頁”的margin固定，當頁數增加到雙位數後，下一頁被擠到下一行瞭。
方法1（同事腦力成果，擔待瞭）：修改class為page_name的margin為百分比。
即
.con .prizelist .page_num{
margin: auto 75rpx;
}
改為：
.con .prizelist .page_num{
margin: auto 10%;
}
方法2（我自己的老辦法）：給“上一頁”“共 頁”“下一個”分別定義class：
<view class="paging">
<view class="up_page" bindtap="up_page" >{{current_page > 1 ? '上一頁' : ''}}</view>
<view class="down_page" bindtap="next_page">{{current_page < last_page ? '下一頁' : ''}}</view>
<view class="page_num">第{{current_page}}頁 共{{last_page}}頁</view>
</view>
樣式：
.con .prizelist .paging{
width: 100%;
height: 108rpx;
font-size: 32rpx;
font-family: "PingFangSC";
color: #ffffff;
line-height: 36rpx;
text-align: center;
}
.con .prizelist .paging .up_page{
width: 96rpx;
height: 32rpx;
float: left;
margin-left: 72rpx;
}
.con .prizelist .paging .down_page{
width: 96rpx;
height: 32rpx;
float: right;
margin-right: 72rpx;
}
.con .prizelist .page_num{
width: 500rpx;
font-size: 24rpx;
font-family: "PingFangSC";
color: #ffffff;
line-height: 36rpx;
margin: auto;
}
（時間：2021年3月22日）
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。