微信小程序实用代码段(持续更新中)
前端历劫之路
共 8642字，需浏览 18分钟
· 2021-11-22
前言
两年前的文章，被收藏了368次。挺实用的，可以看看。排名不分先后，按自己的习惯来的。总结经验，不喜勿喷哦~
一、tab切换
<view class=" {{currentTab==0 ? 'select' : ''}}" data-current="0" bindtap="swichNav"> tab1view>
<view class=" {{currentTab==1 ? 'select' : ''}}" data-current="1" bindtap="swichNav"> tab2view>
Page({
data:{
// tab切换
currentTab: 0,
},
swichNav: function (e) {
var that = this;
if (this.data.currentTab === e.target.dataset.current) {
return false;
} else {
that.setData({
currentTab: e.target.dataset.current
})
}
},
})
二、swiper切换
<view>
<text class=" {{currentTab==0 ? 'select' : ''}}" data-current="0" bindtap="swichNav">tab1text>
<text class=" {{currentTab==1 ? 'select' : ''}}" data-current="1" bindtap="swichNav">tab2 text>
<text class=" {{currentTab==2 ? 'select' : ''}}" data-current="2" bindtap="swichNav">tab3 text>
view>
<swiper current="{{currentTab}}" bindchange="bindChange" class='swp' style="height: {{aheight?aheight+'px':'auto'}}">
<swiper-item>页面1swiper-item>
<swiper-item>页面2swiper-item>
<swiper-item>页面3swiper-item>
swiper>
Page({
data:{
currentTab: 0,
aheight: ''
},
// 滑动切换
bindChange: function (e) {
var that = this;
that.setData({
currentTab: e.detail.current
});
},
//点击tab切换
swichNav: function (e) {
var that = this;
if (this.data.currentTab === e.target.dataset.current) {
return false;
} else {
that.setData({
currentTab: e.target.dataset.current
})
}
},
// swiper 自适应高度
onLoad: function (options) {
var that = this
wx.getSystemInfo({
success: function (res) {
that.setData({
aheight: res.screenHeight
});
}
})
},
})
三、图片上传
<view class="ovf img_box">
<block wx:for="{{img_arr}}" wx:key="{{item.id}}" bindtap="del">
<view class='logoinfo' data-index="{{index}}">
<view class="del">
<image src="http://192.168.2.61/wx_ry/del.png" mode="widthFix" bindtap="deleteImage">image>
view>
<image src='{{item}}' mode="widthFix">image>
view>
block>
<view class="upload">
<image src="http://192.168.2.61/wx_ry/add.png" mode="widthFix" bindtap="upimg">image>
view>
view>
.upload { width: 20%; float: left; margin-top:33rpx ; }
.upload image{ width: 100%; }
.logoinfo{ width: 20%; float: left; margin-right:2% ; }
.del{ width: 20%; float: right; }
.del image{ width: 100%; }
.logoinfo image{ width: 100%; }
page({
data:{
img_arr: []
},
// 图片上传
upimg: function () {
var that = this;
if (this.data.img_arr.length < 3) {
wx.chooseImage({
sizeType: ['original', 'compressed'],
success: function (res) {
that.setData({
img_arr: that.data.img_arr.concat(res.tempFilePaths),
})
}
})
} else {
wx.showToast({
title: '最多上传三张图片',
icon: 'loading',
duration: 3000
});
}
},
// 删除图片
deleteImage: function (e) {
var that = this;
var index = e.currentTarget.dataset.index; //获取当前长按图片下标
console.log(that.data.img_arr)
wx.showModal({
title: '提示',
content: '确定要删除此图片吗？',
success: function (res) {
if (res.confirm) {
console.log('点击确定了');
that.data.img_arr.splice(index, 1);
} else if (res.cancel) {
console.log('点击取消了');
return false;
}
that.setData({
img_arr: that.data.img_arr
});
}
})
},
// 上传
upload: function () {
var that = this
for (var i = 0; i < this.data.img_arr.length; i++) {
wx.uploadFile({
url: 'https:***/submit',
filePath: that.data.img_arr[i],
name: 'content',
formData: adds,
success: function (res) {
console.log(res)
if (res) {
wx.showToast({
title: '已提交发布！',
duration: 3000
});
}
}
})
}
this.setData({
formdata: ''
})
},
// 提交
formSubmit: function (e) {
console.log('form发生了submit事件，携带数据为：', e.detail.value)
}
})
四、scroll-view滚动页
<scroll-view class="scroll-view_H " scroll-x="true" bindscroll="scroll">
<view class="fxjx_b1" style="display: inline-block">
<view class="listb">1view>
view>
<view class="fxjx_b1" style="display: inline-block">
<view class="listb">2view>
view>
scroll-view>
.scroll-view_H{ white-space: nowrap; height: 600rpx; }
.listb{ padding: 25rpx; white-space: normal; }
五、授权登录
app.js
//app.js
App({
globalData: {
userInfo: null,
unionid:null,
token:''
},
onLaunch: function () {
/* 已授权之后，自动获取用户信息 */
// 判断是否授权
wx.getSetting({
success: (res) => { //箭头函数为了处理this的指向问题
if (res.authSetting["scope.userInfo"]) {
console.log("已授权");
// 获取用户信息
wx.getUserInfo({
success: (res) => { //箭头函数为了处理this的指向问题
// this.globalData.isok=true
this.globalData.token='ok'
var that =this
console.log(res.userInfo); //用户信息结果
wx.getStorage({
key: 'unionid',
success(res) {
that.globalData.unionid=res.data
}
})
this.globalData.userInfo = res.userInfo;
if (this.userInfoReadyCallback) { //当index.js获取到了globalData就不需要回调函数了，所以回调函数需要做做一个判断，如果app.js中有和这个回调函数，那么就对这个函数进行调用，并将请求到的结果传到index.js中
this.userInfoReadyCallback(res.userInfo);
}
}
})
}
else{
console.log("未授权");
wx.removeStorage({
key: 'unionid'
})
}
}
})
}
})
wxml
<button open-type="getUserInfo" lang="zh_CN" bindgetuserinfo="onGotUserInfo" class="btn" data-url='../yzzs/yzzs'>
防疫针助手
button>
index.js
// pages/index/index.js
const app = getApp()
Page({
data: {
token:''
},
onGotUserInfo: function (e) {
var that = this
if (this.data.token != 'ok' && app.globalData.token != 'ok') {
wx.getSetting({
success: (res) => { //箭头函数为了处理this的指向问题
if (res.authSetting["scope.userInfo"]) {
wx.login({
success: function (data) {
console.log('获取登录 Code：' + data.code)
var postData = {
code: data.code
};
wx.request({
url: 'https://m.renyiwenzhen.com/rymember.php?mod=xcxlogin&code=' + postData.code + '&nickname=' + e.detail.userInfo.nickName,
data: {},
header: {
'content-type': 'application/json'
},
success: function (res) {
console.log(res.data);
that.data.token='ok';
wx.setStorage({
key: "unionid",
data: res.data.unionid
})
wx.navigateTo({
url: e.target.dataset.url
})
},
fail: function () {
console.log('1');
}
})
},
fail: function () {
console.log('登录获取Code失败！');
}
})
}
}
})
} else{
wx.navigateTo({
url: e.target.dataset.url
})
}
}
})
六、发送请求
wx.request({
url: 'https://m.renyiwenzhen.com/xcx_ajax.php?action=babylist', //仅为示例，并非真实的接口地址
method: 'post',
data: {
unionid: uni
},
header: {
'content-type': 'application/x-www-form-urlencoded' // 默认值
},
success(res) {
// console.log(uni)
console.log(res.data)
that.setData({
list: res.data.bblist
})
}
})
七、标题栏及底部栏
全局标题栏
"window": {
"backgroundTextStyle": "light",
"navigationBarBackgroundColor": "#3EC8C8",
"navigationBarTitleText": "乳孕呵护",
"navigationBarTextStyle": "white"
}
局部标题栏
{
"usingComponents": {},
"navigationBarBackgroundColor": "#fff",
"navigationBarTextStyle": "black",
"navigationBarTitleText": "附近医院"
}
全局底部栏
"tabBar": {
"color": "#e4e4e4",
"selectedColor": "#333",
"list": [
{
"pagePath": "pages/index/index",
"text": "发现",
"iconPath": "./images/find.png",
"selectedIconPath": "./images/finded.png"
},
{
"pagePath": "pages/his/his",
"text": "医院",
"iconPath": "./images/his.png",
"selectedIconPath": "./images/hised.png"
},
{
"pagePath": "pages/stu/stu",
"text": "经验",
"iconPath": "./images/stu.png",
"selectedIconPath": "./images/stued.png"
},
{
"pagePath": "pages/my/my",
"text": "我的",
"iconPath": "./images/my.png",
"selectedIconPath": "./images/myed.png"
}
]
}
八、navigator
1、wxml
<navigator url="/pages/hishome/hishome" open-type="navigate" hover-class="none">
底部栏没有的路由
navigator>
<navigator open-type="switchTab" url="/pages/his/his" hover-class="none">
底部栏有的路由
navigator>
2、js
go: function (e) {
wx.navigateTo({
url: '../eatxq/eatxq?id=' + e.currentTarget.dataset.id + "&name=" + e.currentTarget.dataset.name
})
}
九、加载条
<loading hidden="{{onff}}">加载中loading>
<view>页面view>
加载完成true
wx.request({
url: 'https://m.renyiwenzhen.com/xcx_ajax.php?action=caneatsearch',
method: 'post',
header: {
'content-type': 'application/x-www-form-urlencoded' // 默认值
},
data: {
search: options.search
},
success(res) {
that.setData({
list: res.data.fllist,
onff: true
})
}
})
十、富文本处理
<view class="txt">
<rich-text nodes="{{msg}}" >rich-text>
view>
利用正则修改收到的数据
wx.request({
url: 'https://m.renyiwenzhen.com/xcx_ajax.php?action=cjdetail',
method: 'post',
data: {
id: options.id
},
header: {
'content-type': 'application/x-www-form-urlencoded' // 默认值
},
success(res) {
that.setData({
msg: res.data.cjmag.cjxq.replace(/\/g
, "" )
})
}
})
十一、filter过滤数据
1、在根目录下的utils文件夹里创建一个名为filter.wxs文件
2、写入自己要定义的条件
var xb=function (v) {
var xingb=''
if(v==1){
xingb="男宝宝"
}
else{
xingb="女宝宝"
}
return xingb
}
module.exports = {
xb:xb
}
3、在页面中引入使用
<wxs src="../../utils/filter.wxs" module="filter" />
<view><text>{{filter.xb(isxb)}}text>view>
十二、检测版本更新
app.js
onLaunch: function () {
if (wx.canIUse('getUpdateManager')) {
const updateManager = wx.getUpdateManager()
updateManager.onCheckForUpdate(function (res) {
// 请求完新版本信息的回调
if (res.hasUpdate) {
updateManager.onUpdateReady(function () {
wx.showModal({
title: '更新提示',
content: '新版本已经准备好，是否重启应用？',
success: function (res) {
// res: {errMsg: “showModal: ok”, cancel: false, confirm: true}
if (res.confirm) {
// 新的版本已经下载好，调用 applyUpdate 应用新版本并重启
updateManager.applyUpdate()
}
}
})
})
updateManager.onUpdateFailed(function () {
// 新的版本下载失败
wx.showModal({
title: '已经有新版本了哟~',
content: '新版本已经上线啦，请您删除当前小程序，重新搜索打开哟'
})
})
}
})
}
}
十三、点击tab跳转对应的的项目页面
我们经常会遇到这种需求：
点击对应的的tab，这里比如说是A页。
跳转到对应项目的页面，这里比如说是B页。
A页：
<view class="project_nab ovf">
<view class="on"> 详情 view>
<view class="project_item" bindtap="goitem" data-url='jd'>建档view>
<view class="project_item" bindtap="goitem" data-url='cj'>产检view>
<view class="project_item" bindtap="goitem" data-url='fm'>分娩view>
view>
goitem:function (e) {
wx.navigateTo({
url: '/pages/item/item?url=' + e.target.dataset.url
})
},
B页：
<view class="top1 ovf">
<view class="" ><navigator url="/pages/hishome/hishome" open-type="navigate">详情navigator>view>
<view class=" {{currentTab==0 ? 'select' : ''}}" data-current="0" bindtap="swichNav"> 产检 view>
<view class=" {{currentTab==1 ? 'select' : ''}}" data-current="1" bindtap="swichNav"> 建档 view>
<view class=" {{currentTab==2 ? 'select' : ''}}" data-current="2" bindtap="swichNav"> 分娩 view>
view>
onLoad: function (options) {
var that = this;
console.log(options.url)
if (options.url === 'cj') {
that.setData({
currentTab: '0',
btn: '产检',
set: 'cj'
});
} else if (options.url === 'jd') {
that.setData({
currentTab: '1',
btn: '建档',
set: 'jd'
});
} else {
that.setData({
currentTab: '2',
btn: '分娩',
set: 'fm'
});
}
}
未完待续……
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