<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta name="keywords" content="">
<meta name="description" content="">
<!-- <link rel="stylesheet" href="css/li.css"> -->
<style>
*{
padding: 0;
margin: 0;
}
html,body{
height: 100%;
user-select:none;
}
.screen{
overflow: hidden;
position: relative;
height: 100%;
background-color: rgba(0,0,0,0.8);
background-image: url(img/bright5.gif);
background-repeat: no-repeat;
background-size: 100% 100%;
}
.send{
position: absolute;
bottom: 0;
width: 100%;
height: 80px;
line-height: 80px;
background-color: rgba(10,10,10,0.6);
text-align: center;
}
.input{
position: absolute;
left: 50%;
top: 50%;
margin: -20px -350px;
font-size: 0;
}
.text{
float: left;
width: 600px;
height: 40px;
border: none;
border-radius: 8px 0 0 8px;
}
.s_show div{
position: absolute;
font-size: 24px;
font-weight: bold;
}
.btn{
float: left;
width: 100px;
background-color:black;
line-height: 40px;
font-size: 24px;
color: #fff;
cursor: pointer;
border-radius: 0 8px 8px 0;
}
</style>
<title>Welcome to coming</title>
</head>
<body>
<div class="screen">
<div class="send">
<div class="input clearfix">
<input type="text" class="text">
<div class="btn">Send</div>
</div>
</div>
<div class="s_show">
<div class="magictime twisterInUp">你好！欢迎来到赖清华的世界</div>
<div class="magictime twisterInUp">亲亲，我是爱你的呀</div>
<div class="magictime twisterInUp">"略略略~，你这是简直不要太喜欢我啦！</div>
<div class="magictime twisterInUp">年轻人，不要总是睡喔！</div>
</div>
</div>
<script>
//模块化 每个功能函数去做自己相应的事情 代码可维护性 可扩展性
//初始化函数
var aShowList = document.querySelectorAll(‘.s_show div‘);//获取元素 H5
var oShow = document.querySelector(‘.s_show‘);
var oSend = document.querySelector(‘.send‘);
var oBtn = document.querySelector(‘.btn‘);
var oText = document.querySelector(‘.text‘);
var time = 0;//上一次你发送的时间
var time1 = 0;
//点击发送弹幕
oBtn.onclick = function(){//鼠标点击事件
sendContent();
}
//按键盘的"enter"键发送内容
oText.onkeyup = function (ev) {
var e = ev || window.event;
if (e.keyCode == 13) {
sendContent();
}
}
function sendContent(){
//oBtn.style.backgroundColor = randomColor();//按钮背景颜色变换
time1 = new Date();
oBtn.style.color = randomColor();//按钮字体颜色变换
if(time1 - time > 1000){//2次发送的时间必须大于1秒
var oDiv = document.createElement(‘div‘);//创建div
oDiv.innerHTML = oText.value;//添加弹幕内容
oDiv.className = ‘magictime twisterInUp‘;//弹幕特效
oShow.appendChild(oDiv);//添加一个子节点
init(oDiv);//初始化
oText.value = ‘‘;
time = time1;
//console.log(time);
}else{
alert("略略略~，你这是简直不要太喜欢我啦！请稍后再发~");
}
}
for(var i = 0;i < aShowList.length;i++){
init(aShowList[i]);//执行初始化函数
}
function init(obj){//接受弹幕对象
//确定top值的随机区间
var screenHeight = document.documentElement.clientHeight;//获取屏幕可视高度
var maxTop = screenHeight - oSend.offsetHeight - obj.offsetHeight;//高度差范围
obj.style.top = maxTop * Math.random() + ‘px‘;
//控制left值
var screenWidth = document.documentElement.clientWidth;//获取可视宽度
var maxLeft = screenWidth - obj.offsetWidth - Math.random() * 100;//随机宽度差
obj.style.left = maxLeft + ‘px‘;
//弹幕的随机颜色
obj.style.color = randomColor();
/*setInterval(function(){
move(obj,maxLeft);
},1000);*///普通定时器
move(obj,maxLeft);
}
//弹幕移动函数
function move(obj,maxLeft){
var speed = 5;//控制速度的变量
maxLeft -= speed;//往左移动
if(maxLeft > -obj.offsetWidth){
obj.style.left = maxLeft + ‘px‘;
requestAnimationFrame(function(){
move(obj,maxLeft);
});//H5新增的动画函数
}else{
//init(obj);//重新初始化 营造循环弹幕效果
oShow.removeChild(obj);//DOM删除子节点
}
}
//随机颜色函数
function randomColor(){
return ‘#‘ + Math.random().toString(16).slice(-6);//一行简化版截取后六位
/*var str = ‘#‘;
for(var i = 0;i < 6;i++){
str += Math.floor(Math.random() * 16).toString(16);
}
return str;*///普通逻辑版
}
</script>
</body>
</html>
