JQuery和HTML5 Canvas两种方法实现弹幕效果:
方法一，JQuery实现。
源码：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta content="width=device-width, initial-scale=1"> <!-- <link href="https://www.jb51.net/favicon.ico" type="image/x-icon" /> <link href="https://www.jb51.net/favicon.ico" type="image/x-icon" /> --> <meta content="EditPlus®"> <meta content=""> <meta content=""> <meta content=""> <title>JQuery弹幕</title> <link href="" /> <script type="text/javascript" src="https://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script> <style type="text/css"> .ctxt{ background:#666; width:1000px; height:400px; overflow:hidden; margin:0 auto; } .ctxt p{ position:relative; left:1000px; margin:0; padding:0; } </style> </head> <body> <div></div> <br /> <form method="post" action=""> <input type="text" /> <button type="button">发布</button> </form> <script type="text/javascript"> $(document).ready(function(){ $("#submitBut").click(function(){ var msgtxt=$("#msg").val(); var colortxt = getReandomColor(); var topPos = generateMixed(3); if (topPos > 300) { topPos = 30; } var newtxt = '<p>'+$("#msg").val()+'</p>'; $(".ctxt").prepend(newtxt); var addTextW = $(".ctxt").find("p").width(); $(".ctxt p").animate({left: '-'+addTextW+"px"}, 30000,function(){ $(this).hide(); }); }); }); //随机获取颜色值 function getReandomColor(){ return '#'+(function(h){ return new Array(7-h.length).join("0")+h })((Math.random()*0x1000000<<0).toString(16)) } //生成随机数据。n表示位数 var jschars = ['0','1','2','3','4','5','6','7','8','9']; function generateMixed(n) { var res = ""; for(var i = 0; i < n ; i ++) { var id = Math.ceil(Math.random()*9); res += jschars[id]; } return res; } </script> </body> </html>
方法二，HTML5 Canvas实现。
源码：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta content="width=device-width, initial-scale=1"> <!-- <link href="https://www.jb51.net/favicon.ico" type="image/x-icon" /> <link href="https://www.jb51.net/favicon.ico" type="image/x-icon" /> --> <meta content="EditPlus®"> <meta content=""> <meta content=""> <meta content=""> <title>Canvas弹幕</title> <link href="" /> <style type="text/css"> #c1{background:#f1f1f1;} span{color:#FFFFFF;} </style> </head> <body> <canvas > <span>该浏览器不支持html5</span> </canvas> <br /> <input type="text" value="" placeholder="请输入内容" /> <button>发送</button> <!--<button>Start</button> <button>Stop</button>--> <script type="text/javascript" src="https://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script> <script type="text/javascript"> var sv; var sId; var oC; var oGC; var numW; var numH; var maxTxt = 600; $(function(){ $("#send").click(function(){ clearInterval(sId); var m = $("#smsg").val(); //alert(m); startFun(m); $("#smsg").val('') }); }) function doDraw(msg){ oC = document.getElementById('c1'); oGC = oC.getContext('2d'); numW = oC.width; numH = oC.height; console.log(numW+'-'+numH); oGC.fillStyle="red"; //oGC.fillRect(0,0,numW,100); oGC.fillText(msg,numW,100); } function startFun(msg){ doDraw(msg); sId = setInterval(function(){ if (numW > -610) { numW--; console.log(numW); oGC.clearRect(0,0,oC.width,oC.height); oGC.fillText(msg,numW,100); } else { oGC.clearRect(0,0,oC.width,oC.height); clearInterval(sId); } },10); } </script> </body> </html>