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How does jQuery implement barrage? jQuery code to achieve barrage effect

不言Original: 2018-08-07 11:50:481928browse

The content of this article is about how jQuery implements barrage? The jQuery code for implementing the barrage effect has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The code for jQuery to achieve the barrage effect is as follows:

<!DOCTYPE html><html>
    <head>
        <meta charset="utf-8" />
        <title>JQ实现弹幕效果</title>
        <style type="text/css">
            *{
                padding: 0;
                margin: 0;
            }
            #box{
                height:700px;
                width:1000px;
                margin: 0 auto;
                border:1px solid #000000;
                position: relative;
            }
            #main{
                width:100%;
                height:605px;
                position: relative;
                overflow: hidden;
            }
            p{
                position: absolute;
                left:1000px;
                width:200px;
                top:0;
            }
            #bottom{
                width:100%;
                height:80px;
                background: #ABCDEF;
                text-align: center;
                padding-top: 15px;
                position: absolute;
                left: 0;
                bottom: 0;
            }
            #txt{
                width:300px;
                height:50px;    
            }
            #btn{
                width:100px;
                height:50px;                
            }
        </style>
    </head>
    <body>
        <p id="box">
            <p id="main">
                
            </p>
            <p id="bottom">
                <input type="text" id="txt" placeholder="请输入内容" />
                <input type="button" id="btn" value="发射" />
            </p>
        </p>
        <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
        <script type="text/javascript">
            $(function(){                var pageH=parseInt($("#main").height());                var colorArr=["#cfaf12","#12af01","#981234","#adefsa","#db6be4","#f5264c","#d34a74"];                
                $("#btn").bind("click",auto);
                document.onkeydown=function(e){                    if(e.keyCode == 13){
                        auto();
                    }
                };                function auto(){                    var $value = $("#txt").val();
                    $("#main").append("<p>" + $value + "</p>");
                    $("#txt").val("");                    var _top=parseInt(pageH*(Math.random()));                    var num=parseInt(colorArr.length*(Math.random()));
                    $("p:last-child").css({"top":_top,"color":colorArr[num],"font-size":"20px"});
                    $("p:last-child").animate({"left":"-200px"},10000);
                    $("p:last-child").stop().animate({"left":"-300px"},10000,"linear",function(){
                        $(this).remove();
                   });                
                    //console.log($value);                };
                
            })        </script>
    </body></html>

How does jQuery implement barrage? jQuery code to achieve barrage effect

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