纯编码实现微信小程序弹幕效果(非视频底)
作者:954L
这篇文章主要介绍了微信小程序弹幕纯编码实现,这种效果是非视频底,代码简单易懂,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
效果图
wxml
<view class="index-view"> <image class='background-img' src="/images/background-img.png" mode="widthFix"></image> <view hidden="{{!showInput}}" class='msg-input' style="bottom: {{msgInputBottom}}px;"> <input type="text" confirm-type="send" bindfocus="foucusInput" focus="{{showInput}}" bindconfirm="sendMsg" bindblur="blurInput" adjust-position="{{false}}" value="{{inputVal}}"/> <button size="mini" bindtap="sendMsg">发送</button> </view> <image hidden="{{showInput}}" class='click-img' src="/images/msg-click-btn.png" bindtap="clickSendMsg"></image> </view> <view class="barrage-view"> <view wx:for="{{barrageLineCount}}" wx:for-item="count" wx:for-index="lineIndex" data-index="{{lineIndex}}" wx:key="*this" class="barrage-line"> <view class='barrage-msg' wx:for="{{barrageMsgs[lineIndex].msgInfos}}" wx:key="msg"> <image class='barrage-avatar' src='{{item.avatarUrl}}'></image> <text class='barrage-text'>{{item.msg}}</text> </view> </view> </view>
js
const app = getApp(); Page({ /** * 页面的初始数据 */ data: { msgInputBottom: 0, inputVal: "", showInput: false, barrageLineCount: 10, // 拉取最新弹幕的毫秒值 barragePullMillis: 0, // 最新的弹幕 barrageNewMsgs: [], // 已显示的弹幕,无新弹幕时则循环 barrageSendedMsgs: [], // 弹幕显示数据 barrageMsgs: [] }, foucusInput: function(e) { this.setData({ msgInputBottom: e.detail.height }) }, blurInput: function(e) { this.setData({ inputVal: e.detail.value, msgInputBottom: 0, showInput: false }) }, clickSendMsg: function(e) { this.setData({ showInput: true }) }, sendMsg: function(e) { const msg = this.data.inputVal; if (msg == "") return; const userInfo = app.getUserInfo(); wx.request({ url: app.globalData.baseUrl + '/barrageMsg/', data: { memberId: userInfo.id, msg: msg}, method: 'PUT' }) this.setData({ inputVal: "" }); }, /** * 生命周期函数--监听页面加载 */ onLoad(options) { }, /** * 生命周期函数--监听页面初次渲染完成 */ onReady() { // 初始化barrageLineCount个弹幕行 let barrageMsgs = this.data.barrageMsgs; const barrageLineCount = this.data.barrageLineCount; const nowTimeMillis = new Date().getTime(); for(var i = 0; i < barrageLineCount; i++) barrageMsgs.push({'showTimeMillis': new String(nowTimeMillis - Math.round(Math.random() * barrageLineCount) * 1000), msgInfos: []}); this.setData({ barrageMsgs: barrageMsgs }); // 每隔2s拉取最新的弹幕 setInterval((that) => { wx.request({ url: app.globalData.baseUrl + '/barrageMsg/', data: { timeMillis: that.data.barragePullMillis }, method: 'GET', success: res => { const data = res.data.data; if (data == null) return; that.setData({ barrageNewMsgs: data.barrageMsgList, barragePullMillis: data.lastPullMillis }); } }); }, 2000, this); // 动态显示弹幕 setInterval((that) => { var arrSort = []; const barrageLineCount = this.data.barrageLineCount; for(var i = 0; i < barrageLineCount; i++) arrSort.push(i); arrSort.sort(() => (0.5 - Math.random())); var nowTimeMillis = new Date().getTime(); var barrageNewMsgs = that.data.barrageNewMsgs; if (barrageNewMsgs != null && barrageNewMsgs.length > 0) { // 有最新弹幕 var barrageMsgs = that.data.barrageMsgs; for(var j = 0; j < arrSort.length; j++) { var barrageMsg = barrageMsgs[arrSort[j]]; // 获取最后发起的弹幕超过5s则跟在后面 if (nowTimeMillis - barrageMsg.showTimeMillis > 5000) { // 显示 barrageMsg.showTimeMillis = nowTimeMillis; const barrageNewMsg = barrageNewMsgs[0]; barrageNewMsg.showTimeMillis = nowTimeMillis; barrageMsg.msgInfos.push(barrageNewMsg); barrageMsgs[arrSort[j]] = barrageMsg; // 在最新弹幕中删除此条弹幕 barrageNewMsgs.splice(0, 1); that.setData({ barrageNewMsgs: barrageNewMsgs, barrageMsgs: barrageMsgs }); break; } } } // 回收每个超过10s的弹幕放到barrageSendedMsgs中 var barrageMsgs = that.data.barrageMsgs; for(var i = 0; i < barrageMsgs.length; i++) { var barrageMsg = barrageMsgs[i]; var msgInfos = barrageMsg.msgInfos; if (msgInfos == null || msgInfos.length == 0 || nowTimeMillis - msgInfos[0].showTimeMillis <= 10000) continue; var barrageSendedMsgs = that.data.barrageSendedMsgs; for (var j = 0; j < msgInfos.length; j++) { var msgInfo = msgInfos[j]; if (nowTimeMillis - msgInfo.showTimeMillis <= 10000) break; msgInfos.splice(j, 1); j--; barrageSendedMsgs.push(msgInfo); } barrageMsg.msgInfos = msgInfos; barrageMsgs[i] = barrageMsg; that.setData({ barrageMsgs: barrageMsgs, barrageSendedMsgs: barrageSendedMsgs }); } // 新的弹幕未发完,老弹幕不循环 if (barrageNewMsgs != null && barrageNewMsgs.length > 0) return; // 从barrageSendedMsgs取开头1条进行播放后删除,由上文代码再次放入实现循环 var barrageSendedMsgs = that.data.barrageSendedMsgs; if (barrageSendedMsgs.length == 0) return; var barrageSendedMsg = barrageSendedMsgs[0]; for(var j = 0; j < arrSort.length; j++) { var barrageMsg = barrageMsgs[arrSort[j]]; // 获取最后发起的弹幕超过5s则跟在后面 if (nowTimeMillis - barrageMsg.showTimeMillis > 5000) { // 显示 barrageMsg.showTimeMillis = nowTimeMillis; barrageSendedMsg.showTimeMillis = nowTimeMillis; barrageMsg.msgInfos.push(barrageSendedMsg); barrageMsgs[arrSort[j]] = barrageMsg; // 在已发弹幕中删除此条弹幕 barrageSendedMsgs.splice(0, 1); that.setData({ barrageSendedMsgs: barrageSendedMsgs, barrageMsgs: barrageMsgs }); break; } } }, 500, this); }, /** * 生命周期函数--监听页面显示 */ onShow() { }, /** * 生命周期函数--监听页面隐藏 */ onHide() { }, /** * 生命周期函数--监听页面卸载 */ onUnload() { }, /** * 页面相关事件处理函数--监听用户下拉动作 */ onPullDownRefresh() { }, /** * 页面上拉触底事件的处理函数 */ onReachBottom() { }, /** * 用户点击右上角分享 */ onShareAppMessage() { } })
css
.index-view { display: flex; width: 100%; align-content: center; justify-content: center; } .background-img { width: 100%; } .msg-input { position: absolute; width: 100%; bottom: 0px; background-color: rgba(241, 213, 135, 0.911); } .msg-input input{ margin: 20rpx 1% 10rpx 1%; width: 75%; height: 60rpx; border: none; padding: 5rpx 10px 5rpx 10px; border-radius: 8px; background-color: #ffffff; display: inline-block; } .msg-input button { width: 15%; display: inline-block; font-size: 30rpx; color: rgba(241, 213, 135, 0.911); margin: 20rpx 0px 13rpx 0px; border-radius: 5px; background-color: rgb(247, 40, 40);} .click-img { position: absolute; width: 40%; height: 20%; bottom: 18%; } .barrage-view { position: absolute; top: 10rpx; margin-top: 30rpx; } .barrage-line { height: 80rpx; } .barrage-msg { position: fixed; left: 100%; width: 80%; animation: barrage-msg 10s linear 0s 1; } .barrage-text { height: 45rpx; } .barrage-avatar { width: 45rpx; height: 45rpx; border-radius: 20rpx; margin-right: 10rpx; } @keyframes barrage-msg { from { left: 100%; transform: translateX(0); } to { left: 0; transform: translateX(-100%); } }
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