1.场景

输入关键词 对内容库进行检索 得到搜索结果 反馈给用户。其实也不算是机器人 也类似于搜索的样子 只不过以聊天界面的形式展现出来 当然了 在完成这个流程的过程中 也会出现一些问题 思路记录 仅供参考。

2.思路

2.1 毋庸置疑 首先搭建前端界面 这块没什么可说的 对方和自己的样式最好大多数一样 通过一个‘me’和‘you’来进行区分 比较好

2.2 逻辑处理部分 数据缓存处理

有些可能需要做消息的缓存处理 利用‘键名’和‘键值’保存即可 但当然了 这不是惠话 。如果业务比较简单 一个城市 一个机器人 不要判断今天是今天 有些场景可能会涉及默认消息 比如默认消息 今天只发送一次 然后等明天再发送 怎么判断今天是今天 。所以如下

2.2.1这里最好以城市加一个后缀或者前缀为键值 对发送过的消息进行做缓存处理。把城市做键值 缓存的消息体以json格式 外层数组方便遍历 数组内层每项以对象形式 对象中每一项通过键值对的方式 添加自己所需要的字段内容即可 。

2.2.2 判断今天是否发过默认消息 判断今天是今天 通过时间来区分 时间是唯一的。每发送一条消息时 获取时间 只取年月日 每次发送时从缓存中取时间 若缓存中无时间或缓存中的时间和当前时间不一致则把当前时间存入缓存并发送默认消息 若缓存时间和当前时间一致则不用更新缓存时间。每次发送消息都需要更新本地缓存记录。

2.2.3 缓存的消息一般需要做条数限制 因为小程序对缓存大小有上限 每发一条消息取出缓存中的消息把这条消息加入到取出的数组中 同时判断这个取出的数组长度是否大于最大条数限制 如果超过了就把取出的数组的第一删掉 如果没超过则不用管 然后再把取出的数组存入缓存中即可。

3.代码

3.1wxml

 view class chating-wrapper !--消息展示-- view class record-wrapper view wx:if {{current_list.length}} block wx:for {{current_list}} wx:for-item list wx:for-index listidx !-- 收 -- view class record-chatting-item {{list.kind you ? other : }} wx:if {{list.kind you }} view class record-chatting-item-img /view view class record-chatting-item-text qst view class qst-ul view class qst-li {{list.list_ul}} /view /view /view /view !-- 发 -- view class record-chatting-item {{list.kind me ? self : }} wx:if {{list.kind me }} view class record-chatting-item-text qst view class qst-ul view class qst-li {{list.list_ul}} /view /view /view view class record-chatting-item-img /view /view /block /view /view /view !--输入框-- view class chatinput-wrapper {{input_flag? mb16 : }} view class chatinput-content flex alignC flexSb view class chatinput-img /view view class chatinput-inputOut input class chatinput-input bindinput inputChange bindconfirm inputSend placeholder 请输入关键词 confirm-type send value {{inputValue}} bindfocus inputFocus bindblur inputBlue /input /view view class chatinput-sendOut view class chatinput-send catchtap inputSend 发送 /view /view /view /view 

3.2wxss

page { height: 100%; background-color: #f3f4f6;}.chating-wrapper { width: 100%; min-height: 100%; position: relative; box-sizing: border-box; background: #f6f6f6;}.record-chatting-item { width: 100%; padding: 28rpx 23rpx 0; box-sizing: border-box;}.record-chatting-item-img, .open-data-userAvatarUrl { width: 70rpx; height: 70rpx; border-radius: 100%; display: block; overflow: hidden;}.other { display: flex; flex-direction: row; justify-content: flex-start; color: #222;}.other .record-chatting-item-text { margin-left: 20rpx; margin-right: 0;}.self { display: flex; flex-direction: row; justify-content: flex-end; color: #fff;}.record-chatting-item-text { width: 455rpx; border-radius: 8rpx; background-color: #fff; padding: 26rpx; box-sizing: border-box; word-wrap: break-word; overflow: hidden; font-size: 26rpx; line-height: 42rpx; box-shadow: 0 0 8rpx #dedede;}.qst-li { font-size: 26rpx; line-height: 1.1; padding: 16rpx 6rpx; border-bottom: 1rpx solid #d9d9d9;}.qst-li:last-child { border: none;}/*底部输入框*/.chatinput-wrapper { width: 100%; background-color: #fff; border-bottom: 1rpx solid gray; position: fixed; bottom: 0; left: 0; height: 92rpx;}.chatinput-img { width: 59rpx; height: 59rpx; border-radius: 100%;}.other .record-chatting-item-img,.chatinput-img,.self .record-chatting-item-img { background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAADIEAYAAAD9yHLdAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAAZiS0dEAAAAAAAA UO7fwAAAAlwSFlzAAAASAAAAEgARslrPgAAOplJREFUeNrt3XdcU9f7OPDnJGGGDbKHInuIAycIbutexD3q1ta9W ve1lG34qxbg4rWWeuWupUhG1Fk772TnN8fMW1//XytchO4CTzvf3gp3JPzXPE 92wAhBBCCCGEEEIIIYQQQgghhBBCCCGEEEIIIYQQQgghpAq4bFcAIeVBiPVcxxyBwMpKR6tRjru7paWhpFG5u3vjxnotDZZ7HtTW1u5s1MutiMcrCc27ERVVVsZ2jRFiE2G7AgjVDX/qT3k8a9303Y3cuneHfeQNVPXoQcvpWijo2JEchEew3dUV0shyuKKt/aXSaDzdQXfk50MyMSKSiAjIgzS68P59cJRsgdnXr6caxz 0P7ZM7ajRqg2YQJB9ZJZd/uMQQtMTdUm8vpxA fMobkwnb6eMIFsIJvIEjOzWq AAEohLDYWgHgRr927AUqcgBw 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no-repeat; background-position: center; background-size: 100%;}.chatinput-content { width: 100%; height: 92rpx; box-sizing: border-box; padding: 0 24rpx;}.chatinput-inputOut { width: 490rpx; height: 60rpx; position: relative; box-sizing: border-box; padding-left: 20rpx; padding-right: 20rpx; background: #f0f0f0; border-radius: 60rpx;}.chatinput-inputmask { width: 490rpx; height: 60rpx; position: absolute; left: 0; top: 0; border-radius: 60rpx; z-index: 2;}.chatinput-input { width: 100%; height: 60rpx; border-radius: 60rpx; border: none; display: inline-block; vertical-align: top; font-size: 28rpx; color: #212121; background: #f0f0f0;}.chatinput-sendOut { width: 90rpx; height: 60rpx; position: relative;}.chatinput-sendmask { width: 90rpx; height: 60rpx; position: absolute; left: 0; top: 0; border-radius: 60rpx; color: #fff; background: #d0d0d0; line-height: 60rpx; font-size: 26rpx;}.chatinput-send { width: 90rpx; height: 60rpx; line-height: 60rpx; text-align: center; border-radius: 60rpx; color: #fff; font-size: 26rpx; background-color: orange;}.flex { display: flex;}.alignC { align-items: center;}.flexSb { justify-content: space-between;}.self .record-chatting-item-text { background: #38adfa; margin-right: 20rpx; margin-left: 0;}.mb16{ margin-bottom: 16rpx;}.record-wrapper{ padding-bottom: 122rpx;}

3.3 js

var app getApp();Page({ /** * 页面的初始数据 */ data: { // 输入框的值 inputValue: , // 当前聊天数据的列表的index current_index: 0, // 数据列表 current_list: [], // 缓存最多存的消息条数 max_length: 5, // 是否聚焦 input_flag: false, // 城市 mycity: bj }, /** * 生命周期函数--监听页面显示 */ onShow: function() { var that this; // 首先从缓存中拿缓存的值 若有 则优先渲染 that.getRecord(); }, // 获取缓存记录 getRecord() { var that this; var current_list that.data.current_list; var key_time my that.data.mycity time var key_list my that.data.mycity list // 初始化 var myRecord_time (wx.getStorageSync(key_time) undefined || wx.getStorageSync(key_time) ) ? : wx.getStorageSync(key_time); var myRecord_list (wx.getStorageSync(key_list) undefined || wx.getStorageSync(key_list) ) ? : wx.getStorageSync(key_list); if (myRecord_time myRecord_list.length) { console.log(myRecord_list) that.setData({ current_list: myRecord_list, current_index: myRecord_list.length }, function() { that.scrollToBottom(); }); } }, // 创建缓存记录 setRecord(par_kind, par_list) { var that this; var current_list that.data.current_list; var key_time my that.data.mycity time var key_list my that.data.mycity list // 初始化 var myRecord_time (wx.getStorageSync(key_time) undefined || wx.getStorageSync(key_time) ) ? : wx.getStorageSync(key_time); var myRecord_list (wx.getStorageSync(key_list) undefined || wx.getStorageSync(key_list) ) ? [] : wx.getStorageSync(key_list); if (!myRecord_time) { wx.setStorage({ key: key_time, data: myRecord_time, }); } if (!myRecord_list) { wx.setStorage({ key: key_list, data: [], }); } myRecord_time wx.getStorageSync(key_time); // 如果缓存中没有时间 或者 和今天的截止时间不一致时 须把今天的截止日期赋给它 同时发送默认消息 同时把截止日赋值给缓存 同时发送默认消息 同时把默认消息开关设置为true if (myRecord_time ) { myRecord_time get_endtime(); // 用最新的覆盖 wx.setStorage({ key: key_time, data: myRecord_time, }); } // 列表(将获取到的数据从头部添加 相当于最新的) var listdata { kind : par_kind, list_ul : par_list }; if (par_kind par_list) { myRecord_list.push(listdata) } // 如果超过最大长度 需要截断 if (myRecord_list.length that.data.max_length) { myRecord_list.splice(0, 1) } wx.setStorage({ key: key_list, data: myRecord_list, }); }, // 改变消息列表 change_list(par_kind, par_list) { var that this; var current_index that.data.current_index; var data_key current_list[ that.data.current_index ] var listdata { kind : par_kind, list_ul : par_list }; that.setData({ current_index: current_index 1, [data_key]: listdata, }); if (par_kind me ) { that.setData({ inputValue: }); } }, /** * 文本框输入事件 */ inputChange(e) { var that this; that.setData({ inputValue: e.detail.value, }); }, // 发送消息 inputSend() { var that this; var inputValue that.data.inputValue; if (inputValue) { var param { city: that.data.mycity, keyword: inputValue, } // 创建记录 往上滚动 that.scroll_record_list( me , inputValue); // 搜索结果 var num_arr [ 你好哇 , 我是元气满满的萌妹子 , 你问这个干什么 , 尼古拉·阿列克谢耶维奇·奥斯特洛夫斯基 , 我在你的内心深处 var num Math.floor(Math.random() * 5); console.log(num) if (num ! 6) { that.scroll_record_list( you , num_arr[num]); } else { that.scroll_record_list( you , 没有搜索到 inputValue 相关内容 } } }, // 聚焦 失焦 inputFocus(e) { var that this; that.setData({ input_flag: true }); }, inputBlue() { var that this; that.setData({ input_flag: false }); }, // 创建记录 同时页面往上滚动 scroll_record_list(par_kind, par_list) { var that this; // 改变消息列表 that.change_list(par_kind, par_list); // 创建记录 that.setRecord(par_kind, par_list); // 往上滚动 that.scrollToBottom(); }, /** * 滚动页面到底部 */ scrollToBottom() { wx.pageScrollTo({ scrollTop: 999999, duration: 100 }); },})// 获取当日23 59 59时间function get_endtime() { var time_end new Date(new Date(new Date().toLocaleDateString()).getTime() 24 * 60 * 60 * 1000 - 1); var time_format format_date(time_end) return time_format;}// 获取当前时间的 年月日时分秒 的时间格式化 20191220100246function format_date(now) { var year now.getFullYear(); //年 var month now.getMonth() //月 var day now.getDate(); //日 var hh now.getHours(); //时 var mm now.getMinutes(); //分 var ss now.getSeconds(); //秒 var clock year if (month 10) { clock 0 } clock month if (day 10) { clock 0 } clock day if (hh 10) { clock 0 } clock hh if (mm 10) { clock 0 } clock mm; if (ss 10) { clock 0 } clock ss; return clock;}

4.效果

5.说明

5.1 最好封装一个滚动函数 每次发送消息或者每次一进入页面从缓存中读取数据并赋值给当前渲染的数组以后页面就会渲染更新 此时也需要将页面滚动到最底部才比较合理 封装滚动函数后在这两个地方可直接调用就好了

5.2 键盘需要做一个底部悬浮 但你会发现 position:fixed;bottom:0 当键盘弹起后 键盘会贴着input的底框框 此时需要做一个聚焦和失焦的处理 聚焦 也就是键盘弹起后给以margin-bottom 失焦的时候再把底部的margin-bottom去掉即可

5.3 最开始我还想过通过index做键值的方式对消息缓存更新 后来感觉会有问题 index不靠谱 会出现重复 如果我发了二十条 有一个index二十 明天只取十条 我明天再发到第二十条的index就和之前的index值一样了 这条可忽略

5.4 对于键盘弹起的问题 如果页面消息比较少会存在键盘把消息顶上去的情况 其实对于顶的情况 微信和QQ都是默认让顶的 这样每次都能保证在输入框聚焦的时候 能看到最后一条消息 这也时合理的 。如果你有特别的需要 你们公司产品不让顶上去 可以参考 思路 键盘固定 聚焦也固定 当消息比较多的时候 会挡住最后几条 。其实对于需要顶或者不顶各有优劣吧 根据自己需求取舍。