微信小程序实用代码段（持续更新中）

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"> tab1</view>
<view class=" {{currentTab==1 ? 'select' : ''}}" data-current="1" bindtap="swichNav"> tab2</view>

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">tab1</text>
                <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1</swiper-item>
   <swiper-item>页面2</swiper-item>
   <swiper-item>页面3</swiper-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">1</view>
     </view>
     <view class="fxjx_b1" style="display: inline-block">
      <view class="listb">2</view>
     </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(/\<p>/g, "<p style='line-height: 24px; font-size:15px;text-align: justify;margin:15px 0;'>")
        })
      }
    })

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……