JQuery和HTML5 Canvas实现弹幕效果
编程学习 2021-07-04 19:20www.dzhlxh.cn编程入门
这篇文章主要介绍了JQuery和HTML5 Canvas两种方法实现弹幕效果，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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 name="viewport" content="width=device-width, initial-scale=1">
<!--
<link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
<link href="favicon.ico" rel="Bookmark" type="image/x-icon" />
-->
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>JQuery弹幕</title>
<link href="" rel="stylesheet" />
<script type="text/javascript" src="http://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 id="" class="ctxt"></div>
<br />
<form method="post" action="" align="center">
<input type="text" id="msg" style="height:24px;width:200px;" /> <button type="button" id="submitBut">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 style="top:'+topPos+'px; color:'+colortxt+'">'+$("#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 name="viewport" content="width=device-width, initial-scale=1">
<!--
<link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
<link href="favicon.ico" rel="Bookmark" type="image/x-icon" />
-->
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Canvas弹幕</title>
<link href="" rel="stylesheet" />
<style type="text/css">
#c1{background:#f1f1f1;}
span{color:#FFFFFF;}
</style>
</head>
<body>
<canvas id="c1" width="600" height="300" >
<span>该浏览器不支持html5</span>
</canvas>
<br />
<input type="text" name='smsg' value="" id="smsg" placeholder="请输入内容" /> <button id="send">发送</button>
<!--<button id='start' onclick="startFun('test')">Start</button>
<button id='stop' onclick="stopFun()">Stop</button>-->
<script type="text/javascript" src="http://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>
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