记录项目特点，主要为小程序，mpvue框架，项目实现的抽取一些公共方法，以及常用小程序api方法

mpvue：

　　1、多层数据绑定中，无法实时更新，比如，object.obj1.obj2这种三层以上的，赋值的时候不会实时更新，最好重新定义一个新的值，newObject = object.obj1.obj2　　

　　2、 小程序路由封装： 

//保留当前页面，跳转到应用内的某个页面，使用wx.navigateBack可以返回到原页面。
export const navigateTo = function(url) {
  console.log(`跳转的链接：${url}`);
  wx.navigateTo({
    url: url,
    success: () => {},
    fail: () => {},
    complete: () => {}
  })
}
// //关闭当前页面，跳转到应用内的某个页面。
export const redirectTo = function(url) {
  console.log(`跳转的链接：${url}`);
  wx.redirectTo({
    url: url,
    success: () => {},
    fail: () => {},
    complete: () => {}
  })
}
//回到一级页面。
export const reLaunch = function(url) {
  console.log(`跳转的链接：${url}`);
  wx.reLaunch({
    url: url,
    success: () => {},
    fail: () => {},
    complete: () => {}
  })
}

3、保存图片到本地的封装

/**
 * 保存图片到本地
 */
export const saveImg = function(str) {
  let self = this;
  let img = str.replace(/http:/, "https:")
  wx.getSetting({
    success(res) {
      if (!res.authSetting['scope.writePhotosAlbum']) {
        // 接口调用询问
        wx.authorize({
          scope: 'scope.writePhotosAlbum',
          success() {
            saveToPhotosAlbum(img);
          },
          fail() {
            // 重新打开设置页面  用户之前拒绝了授权
            if (res.authSetting['scope.writePhotosAlbum'] == undefined) {
              valid.showPlugin('提示',`授权失败`)
            } else {
              valid.showPlugin(`提示`,`请先授权保存到相册`,()=>{
                wx.openSetting({
                  success: ()=> {
                    saveToPhotosAlbum(img);
                  },
                  fail: ()=> {}
                });
              },true)
            }
          }
        })
      } else {
        console.log(img);
        saveToPhotosAlbum(img)
      }
    },
    fail(res) {}
  })
}
var saveToPhotosAlbum = function(img) {
  wx.getImageInfo({
    src: img,
    success: function(ret) {
      var path = ret.path;
      wx.saveImageToPhotosAlbum({
        filePath: path,
        success(result) {
          wx.showToast({
            title: '保存成功',
            icon: 'success',
            duration: 2000
          })
        }
      })
    }
  })
}

4、小程序录音方法的实现

　　4.1、第一步打开录音授权

/**
             * 打开录音授权
             */
            getLuVoice(){
                wx.getSetting({ 
                    success: res => {
                        console.log(res)
                        if(!res.authSetting['scope.record']){
                            console.log('21213424')
                            wx.authorize({
                              scope:'scope.record',
                              success: res => {
                                console.log(res)
                              },
                              fail: () => {
                                if(res.authSetting['scope.record'] == undefined){
                                    // this.showPlugin('提示','授权失败')
                                }else {
                                    this.showPlugin('提示','请重新授权录音',(res)=>{
                                        // console.log(res)
                                        wx.openSetting({ 
                                            success: res => {
                                                console.log(res)
                                                this.uploadVoice()
                                            } 
                                        });
                                    })
                                }
                              },
                              complete: () => {}
                            });
                            
                        }else {
                            this.uploadVoice()
                        }
                    } 
                });
                
            },

　　4.2、录音数据组成： 

voice: {
    state: -1, //0未开始 1录音中 2已完成
    film: 0,
 },
   recorderManager: wx.getRecorderManager()；
   backgroundAudioManager: wx.getBackgroundAudioManager()；

　　4.3、开始执行录音

/**
             * 开始录语音
             */
            uploadVoice(){
                
                this.recorderManager.start({
                    duration: 300000,
                    format:'mp3'
                })
                this.recorderManager.onStart(() => {
                    console.log('recorder start')
                    this.voice.state = 1
                    this.voice.film = 0
                    this.timeInterval = setInterval(()=> {
                        this.voice.film++;
                        if (this.voice.film == 300 ) {
                            clearInterval(this.timeInterval);
                        }
                    }, 1000)
                })
                this.recorderManager.onStop((res) => {
                    console.log('recorder stop')
                    this.voice.state = 0
                    clearInterval(this.timeInterval);
                    console.log(res)
                    this.uploadQN(res)
                })
                this.recorderManager.onFrameRecorded((res) => {
                    this.voice.state = 0
                    clearInterval(this.timeInterval);
                    console.log(res)
                    this.uploadQN(res) //  这是把获取的录音链接上传到服务器
                })
            },

　　4.4、播放录音

/**
             * 播放录音
             */
            playAudio(obj,index){
                if (this.audioIndex > -1) {
                    this.voiceArr[this.audioIndex].state = 0
                }
                this.backgroundAudioManager.title = 'play';
                this.backgroundAudioManager.src = obj.url
                this.backgroundAudioManager.onPlay(()=>{
                    console.log('开始播放')
                    this.voiceArr[index].state = 1
                    // this.
                })
                this.backgroundAudioManager.onPause(()=>{
                    console.log('播放暂停')
                    this.voiceArr[index].state = 0
                })
                this.backgroundAudioManager.onTimeUpdate(()=>{
                    console.log('播放中')
                    console.log(this.backgroundAudioManager.duration)
                    console.log(this.backgroundAudioManager.currentTime)
                    this.voiceArr[index].time = parseInt(this.backgroundAudioManager.duration - this.backgroundAudioManager.currentTime) < 0? 0 : parseInt(this.backgroundAudioManager.duration - this.backgroundAudioManager.currentTime)
                })
                this.backgroundAudioManager.onEnded(()=>{
                    console.log('播放结束')
                    this.voiceArr[index].state = 0
                })
            },

注释：这个是把音视频的时间转换方法

/**
             *  转换音频时长显示
             *  parseInt(duration/60) 是将秒转换为整分
             *  duration%60 是取余，也就是整分后剩余的秒
             *  minute+isM0+sec 就是分:秒（02:14）的格式
             */
            transTime: function (time) {
                let duration = parseInt(time);
                let minute = parseInt(duration / 60);
                let sec = duration % 60 + '';
                let isM0 = ':';
                if (minute === 0) {
                minute = '00';
                } else if (minute < 10) {
                minute = '0' + minute;
                }
                if (sec.length === 1) {
                sec = '0' + sec;
                }
                return minute + isM0 + sec
            },

5、使用扫码场景值进入小程序，解析链接并获取自定义参数

/**
 * 处理场景值、问号后参数、Storage参数
 */
export const handleParameter = function(options) {
  console.log(`扫码的场景值：${options.scene}`);
  let sceneObj = new Object;
  if (options.scene) {
    let scene = decodeURIComponent(options.scene)
    let ary  = scene.split('#');
    for (let i = 0; i < ary.length; i++) {
     //  以下是自定义参数  根据自己项目需求改动，生成的二维码的参数排列也是这中形式，不然解析对不上
      if (i==0) {
        sceneObj.dId = ary[i]
      } else if (i==1) {
        sceneObj.cid = ary[i]
      } else if (i==2 && ary[i]) {
        sceneObj.sid = ary[i]
      } else if (i==3 && ary[i]) {
        sceneObj.sourceName = ary[i]
      } else if (i==4 && ary[i]) {
        sceneObj.shareUserId = ary[i]
      } else if (i==5 && ary[i]) {
        sceneObj.shareUserId1 = ary[i]
      } else if (i==6 && ary[i]) {
        sceneObj.code = ary[i]
      } else if (i==7 && ary[i]) {
        sceneObj.groupId = ary[i]
      }
    }
  }
  let obj = {};
  if (options.dId) {
    obj.dId = options.dId;
    wx.setStorageSync('dId',obj.dId)
  } else if (sceneObj.dId) {
    console.log(sceneObj)
    obj.dId = sceneObj.dId
    wx.setStorageSync('dId',obj.dId)
  } else if (wx.getStorageSync('dId')){
    obj.dId = wx.getStorageSync('dId')
  }

  if (options.cid) {
    obj.cid = options.cid
  } else if (sceneObj.cid) {
    obj.cid = sceneObj.cid
  }
  if (options.sid) {
    obj.sid = options.sid
  } else if (sceneObj.sid) {
    obj.sid = sceneObj.sid
  }
  if (options.sourceName) {
    obj.sourceName = options.sourceName;
    wx.setStorageSync('sourceName',obj.sourceName)
  } else if (sceneObj.sourceName) {
    getpathway(sceneObj.sourceName)
  }

  if (options.shareUserId) {
    obj.shareUserId = options.shareUserId
    wx.setStorageSync('shareUserId',obj.shareUserId)
  } else if (sceneObj.shareUserId) {
    console.log(sceneObj);
    obj.shareUserId = sceneObj.shareUserId
    wx.setStorageSync('shareUserId',obj.shareUserId)
  }

  if (options.shareUserId1) {
    obj.shareUserId1 = options.shareUserId1
    wx.setStorageSync('shareUserId1',obj.shareUserId1)
  } else if (sceneObj.shareUserId1) {
    obj.shareUserId1 = sceneObj.shareUserId1
    wx.setStorageSync('shareUserId1',obj.shareUserId1)
  }
  if (options.code) {
    obj.code = options.code
  } else if (sceneObj.code) {
    obj.code = sceneObj.code
  }
  if (options.groupId) {
    obj.groupId = options.groupId
  } else if (sceneObj.groupId) {
    obj.groupId = sceneObj.groupId
  }
  return obj
}

6、快速获取分享的链接，公共方法，并携带参数    注：主要是自己拿来记录的 并不适合用大众

/**
 * 获取新的分享链接
 */
export const getShareLink = function(){
  let uInfo = wx.getStorageSync('uInfo');
  let shareUserId = wx.getStorageSync('shareUserId');
  let shareUserId1 = wx.getStorageSync('shareUserId1');
  let link = "";
  if (uInfo) {
    if (shareUserId) {
      if (shareUserId == uInfo.userId) {
        if (shareUserId1) {
          link = `shareUserId=${uInfo.userId}&shareUserId1=${shareUserId1}`
        } else {
          link = `shareUserId=${uInfo.userId}`
        }
      } else {
        link = `shareUserId=${uInfo.userId}&shareUserId1=${shareUserId}`
      }
    } else {
      link = `shareUserId=${uInfo.userId}`
    }
  } else {
    if (shareUserId && shareUserId1) {
      link = `shareUserId=${shareUserId}&shareUserId1=${shareUserId1}`
    } else {
      if (shareUserId) {
        link = `shareUserId=${shareUserId}`
      } else {
        link = ""
      }
    }
  }
  if (link) {
    if (getoptions().indexOf('?') > -1) {
      return `${getoptions()}&${link}`
    } else {
      return `${getoptions()}?${link}`
    }
  } else {
    return getoptions()
  }
}
/**
 * 新的分享链接
 */
var getoptions = function(){
  var pages = getCurrentPages() //获取加载的页面
  var currentPage = pages[pages.length - 1] //获取当前页面的对象
  var url = currentPage.route //当前页面url
  var options = currentPage.options //如果要获取url中所带的参数可以查看options
  let specialAty = ['shareUserId','shareUserId1','sourceName','scene']
  let aryRe = [];
  options.dId = options.dId ? options.dId : wx.getStorageSync('dId')
  let sceneObj = new Object;
  if (!isEmpty(options)) {
    if (options.scene) {
      let scene = decodeURIComponent(options.scene)
      let ary  = scene.split('#');
      for (let i = 0; i < ary.length; i++) {
        if (i==0) {
          sceneObj.dId = ary[i]
        } else if (i==1) {
          sceneObj.cid = ary[i]
        } else if (i==2 && ary[i]) {
          sceneObj.sid = ary[i]
        } else if (i==3 && ary[i]) {
          sceneObj.sourceName = ary[i]
        } else if (i==4 && ary[i]) {
          sceneObj.shareUserId = ary[i]
        } else if (i==5 && ary[i]) {
          sceneObj.shareUserId1 = ary[i]
        } else if (i==6 && ary[i]) {
          sceneObj.code = ary[i]
        }
      }
    }
    if (!isEmpty(sceneObj)) {
      if (sceneObj.sourceName) {
        getpathway(sceneObj.sourceName)
      }
      options = sceneObj
    }
    for (var variable in options) {
      if (!specialAty.includes(variable)) {
        if (options.hasOwnProperty(variable)) {
          aryRe.push(`${variable}=${options[variable]}`)
        }
      }
    }
  }
  if (aryRe.length > 0) {
    url += `?${aryRe.join('&')}`
  }
  if (getSourceName()) {
    if (url.indexOf('?') > -1) {
      return `/${url}&${getSourceName()}`
    } else {
      return `/${url}?${getSourceName()}`
    }
  } else {
    return `/${url}`
  }
}
/**
 * 获取渠道
 */
export const getpathway = function(sourceName){
  flyGet(_url.GER_PATHWAY, {
    pathwayId: sourceName
  }, (res) => {
    if (res.data.code == 1000 && res.data.result) {
      let ary = res.data.result;
      wx.setStorageSync('sourceName',ary.pathwayId)
    }
  })
}
/**
 * 获取本人的sourceName
 */
var getSourceName = function(){
  let uInfo = wx.getStorageSync('uInfo');
  if (uInfo && uInfo.vipSourceName) {
    return `sourceName=${uInfo.vipSourceName}`
  } else if (wx.getStorageSync('sourceName')) {
    return `sourceName=${wx.getStorageSync('sourceName')}`
  } else {
    return ""
  }
}

记录安卓手机的一些问题：

　　1、在小程序弹窗的时候，安卓手机点击手机的返回，可以把弹窗消失，如果在做一些限制的话，就会无法得到想要的效果，封装弹窗时，在后面多做判断

　　

/**
 * 显示弹窗
 * @return {[type]} [description]
 */
export const showPlugin = function(title = "提示", content, callback, showCancel = false){
  wx.showModal({
    title: title,
    content: content,
    showCancel: showCancel,
    success: (res)=> {
      if (res.confirm) {
        if (callback) {
          callback()
        }
      }else if(res.cancel){  // 防止安卓手机的返回
        callback()
      }else {   // 防止安卓手机的返回
        callback()   
      }
    }
  })
}

js基本的正则判断：https://mp.weixin.qq.com/s/U1dP7effxMZvLGRa8g5Lrg

7、小程序复制内容：

/**
 * 设置系统剪贴板的内容
 */
export const clipboard = function(data){
  wx.setClipboardData({
    data: data,
    success: (res)=> {
      wx.showToast({
        title: '内容已复制',
        icon: 'success',
        duration: 2000
      })
    },
    fail: (res)=>{
      wx.showToast({
        title: `复制失败！`,
        icon: 'none',
        duration: 2000
      })
    }
  })
}

8、小程序预览图片

/**
 * 预览图片
 */
export const previewImg = function(current,urls){
  console.log(urls);
  wx.previewImage({
    current: current, // 当前显示图片的http链接
    urls: urls?urls:[current] // 需要预览的图片http链接列表
  })
}

9、canvas实现画图、画海报，其中文字换行，头像圆形，渲染文字的方法 

/**
 * 文本换行
 * @param {Object} obj
 */
export const textWrap = function(obj){
  let tr = getTextLine(obj);
  for (let i = 0; i < tr.length; i++) {
    if (i < obj.line){
      let txt = {
        context: obj.context,
        x: obj.x,
        y: obj.y + (i * obj.height),
        color: obj.color,
        size: obj.size,
        align: obj.align,
        baseline: obj.baseline,
        text: tr[i],
        bold: obj.bold
      };
      if (i == obj.line - 1) {
        if (tr.length > obj.line) {
          txt.text = txt.text.substring(0, txt.text.length - 1) + '...';
        }
      }
      drawText(txt);
    }
  }
}
/**
 * 渲染文字
 *
 * @param {Object} obj
 */
var drawText = function (obj) {
  obj.context.save();
  obj.context.setFillStyle(obj.color);
  obj.context.setFontSize(obj.size);
  obj.context.setTextAlign(obj.align);
  obj.context.setTextBaseline(obj.baseline);
  if (obj.bold) {
    obj.context.fillText(obj.text, obj.x, obj.y - 0.5);
    obj.context.fillText(obj.text, obj.x - 0.5, obj.y);
  }
  obj.context.fillText(obj.text, obj.x, obj.y);
  if (obj.bold) {
    obj.context.fillText(obj.text, obj.x, obj.y + 0.5);
    obj.context.fillText(obj.text, obj.x + 0.5, obj.y);
  }
  obj.context.restore();
}
/**
 * 获取文本折行
 * @param {Object} obj
 * @return {Array} arrTr
 */
var getTextLine = function(obj){
  obj.context.setFontSize(obj.size);
  let arrText = obj.text.split('');
  let line = '';
  let arrTr = [];
  for (let i = 0; i < arrText.length; i++) {
    var testLine = line + arrText[i];
    var metrics = obj.context.measureText(testLine);
    var width = metrics.width;
    if (width > obj.width && i > 0) {
      arrTr.push(line);
      line = arrText[i];
    } else {
      line = testLine;
    }
    if (i == arrText.length - 1) {
      arrTr.push(line);
    }
  }
  return arrTr;
}

/**
 * 圆形头像
 */
export const circleImg = function(context, img, x, y, r){
  context.save();
  var d = 2 * r;
  var cx = x + r;
  var cy = y + r;
  context.beginPath();
  context.arc(cx, cy, r, 0, 2 * Math.PI);
  context.clip();
  context.drawImage(img, x, y, d, d);
  context.restore()
}