JQ effect achieved barrage

Code below, copy can be used:
 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4     <meta charset="utf-8" />
 5     <title>JQ实现弹幕效果</title>
 6     <style type="text/css">
 7         *{
 8             padding: 0;
 9             margin: 0;
10         }
11         #box{
12             height:700px;
13             width:1000px;
14             margin: 0 auto;
15             border:1px solid #000000;
16             position: relative;
17         }
18         #main{
19             width:100%;
20             height:605px;
21             position: relative;
22             overflow: hidden;
23         }
24         p{
25             position: absolute;
26             left:1000px;
27             width:200px;
28             top:0;
29         }
30         #bottom{
31             width:100%;
32             height:80px;
33             background: #ABCDEF;
34             text-align: center;
35             padding-top: 15px;
36             position: absolute;
37             left: 0;
38             bottom: 0;
39         }
40         #txt{
41             width:300px;
42             height:50px;
43         }
44         #btn{
45             width:100px;
46             height:50px;
47         }
48     </style>
49 </head>
50 <body>
51 <div id="box">
52     <div id="main">
53 
54     </div>
55     <div id="bottom">
56         <input type="text" id="txt" placeholder="请输入内容" />
57         <input type="button" id="btn" value="发射" />
58     </div>
59 </div>
60 <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
61 <script type="text/javascript">
62     $(function(){
63         var pageH=parseInt($("#main").height());
64         var colorArr=["#cfaf12","#12af01","#981234","#adefsa","#db6be4","#f5264c","#d34a74"];
65         $("#btn").bind("click",auto);
66         document.onkeydown=function(e){
67             if(e.keyCode == 13){
68                 auto();
69             }
70         };
71         function auto(){
72             var $value = $("#txt").val();
73             $("#main").append("<p>" + $value + "</p>");
74             $("#txt").val("");
75             var _top=parseInt(pageH*(Math.random()));
76             var num=parseInt(colorArr.length*(Math.random()));
77             $("p:last-child").css({"top":_top,"color":colorArr[num],"font-size":"20px"});
78             $("p:last-child").animate({"left":"-200px"},10000);
79             $("p:last-child").stop().animate({"left":"-300px"},10000,"linear",function(){
80                 $(this).remove();
81             });
82             //console.log($value);
83         };
84 
85     })
86 </script>
87 </body>
88 </html>
链接：https://mp.weixin.qq.com/s/uxtHkWhFlU-PjKH5jsBnog
JQ effect achieved barrage

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