微信小程序实现弹幕墙（祝福墙）

本文实例为大家分享了微信小程序实现弹幕墙的具体代码，供大家参考，具体内容如下

为了解决左右弹幕重叠问题，也是找了网上挺多案例，最后都不行，最后利用四个数组和css3动画animation来解决
这是个祝福墙，用户发送弹幕到后台审核，审核通过显示在前端

<!-- 弹幕墙 -->
<view class="barrage" wx:if="{{ispush}}">
 <view class="barrage-a">
 <view class="barrage-b"><image src="../../images/img/a-13.png"></image></view>
 <view class="barrage-c">
 <view class="video_container">
 <view class='danmu'>
 <view class="danmu_wrapper">
 <view class="li0" wx:if="{{danmufake0.cnt}}" style="width:{{danmufake0.max}}rpx; animation: dmanimation {{danmufake0.max / 150}}s linear 1s infinite backwards;">
 <view wx:for="{{danmufake0.cnt}}" wx:key="danmufake0cntindex" data-idx="{{item.idx}}" data-width="{{item.width}}" class='danmu-li rowandcolcenter' style="left:{{item.left}}rpx">
 <text>{{item.title}}</text>
 </view>
 </view>
 <view class="li1" wx:if="{{danmufake1.cnt}}" style="width:{{danmufake1.max}}rpx; animation: dmanimation {{danmufake1.max / 150}}s linear 3s infinite backwards;">
 <view wx:for="{{danmufake1.cnt}}" wx:key="danmufake1cnt" data-idx="{{item.idx}}" data-width="{{item.width}}" class='danmu-li rowandcolcenter' style="left:{{item.left}}rpx">
 <text>{{item.title}}</text>
 </view>
 </view>
 <view class="li2" wx:if="{{danmufake2.cnt}}" style="width:{{danmufake2.max}}rpx; animation: dmanimation {{danmufake2.max / 150}}s linear 5s infinite backwards;">
 <view wx:for="{{danmufake2.cnt}}" wx:key="danmufake2cnt" data-idx="{{item.idx}}" data-width="{{item.width}}" class='danmu-li rowandcolcenter' style="left:{{item.left}}rpx">
 <text>{{item.title}}</text>
 </view>
 </view>
 <view class="li3" wx:if="{{danmufake3.cnt}}" style="width:{{danmufake3.max}}rpx; animation: dmanimation {{danmufake3.max / 150}}s linear 7s infinite backwards;">
 <view wx:for="{{danmufake3.cnt}}" wx:key="danmufake3cnt" data-idx="{{item.idx}}" data-width="{{item.width}}" class='danmu-li rowandcolcenter' style="left:{{item.left}}rpx">
 <text>{{item.title}}</text>
 </view>
 </view>

 </view>
 </view>
 </view>
 <form>
 <view class="danmugrop">
 <input type="text" name="name" bindinput="getinput" class="danmuinput" placeholder='请输入你的祝福语' placeholder-style="color:#b6b2a6;opacity:.55;"></input>
 <button style="width:108rpx;" class="senddanmu" bindtap='senddanmu' form-type='reset'>
 <image src="/images/img/a-3.png"></image>
 <text>发送</text>
 </button>
 </view>
 </form>
 </view>
 </view>
</view>

js:

var danmu0=[];
var danmu1=[];
var danmu2=[];
var danmu3=[];
 for (var i = 0; i < res.data.entity.length; i++) {
 const num = math.floor(math.random() * 4);
 if(num == 0){
 var left = 0;
 if(danmu0.length){left = danmu0[danmu0.length-1].left + danmu0[danmu0.length-1].width + 80;}
 left = left < 0 ? 0 : left;
 danmu0.push({
 title: res.data.entity[i].newscontent,
 left: left,
 width:res.data.entity[i].newscontent.length*24,
 idx: num
 });
 }
 if(num == 1){
 var left = 0;
 if(danmu1.length){left = danmu1[danmu1.length-1].left + danmu1[danmu1.length-1].width + 80;}
 left = left < 0 ? 0 : left;
 danmu1.push({
 title: res.data.entity[i].newscontent,
 width:res.data.entity[i].newscontent.length*24,
 left: left,
 idx: num
 });
 }
 if(num == 2){
 var left = 0;
 if(danmu2.length){left = danmu2[danmu2.length-1].left + danmu2[danmu2.length-1].width + 80;}
 left = left < 0 ? 0 : left;
 danmu2.push({
 title: res.data.entity[i].newscontent,
 width:res.data.entity[i].newscontent.length*24,
 left: left,
 idx: num
 });
 }
 if(num == 3){
 var left = 0;
 if(danmu3.length){left = danmu3[danmu3.length-1].left + danmu3[danmu3.length-1].width + 80;}
 left = left < 0 ? 0 : left;
 danmu3.push({
 title: res.data.entity[i].newscontent,
 width:res.data.entity[i].newscontent.length*24,
 left: left,
 idx: num
 });
 }
 }
 that.setdata({
 danmufake0: {
 max : danmu0[danmu0.length-1].left + danmu0[danmu0.length-1].width + 80,
 cnt:danmu0
 },
 danmufake1: {
 max : danmu1[danmu1.length-1].left + danmu1[danmu1.length-1].width + 80,
 cnt:danmu1
 },
 danmufake2: {
 max : danmu2[danmu2.length-1].left + danmu2[danmu2.length-1].width + 80,
 cnt:danmu2
 },
 danmufake3: {
 max : danmu3[danmu3.length-1].left + danmu3[danmu3.length-1].width + 80,
 cnt:danmu3
 }
 })

 var danmumaxwid = math.max(that.data.danmufake0.max,that.data.danmufake1.max,that.data.danmufake2.max,that.data.danmufake3.max);
 that.setdata({
 danmumaxwid:danmumaxwid
})

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