var subtitle = document.getElementById("subtitle");
var fire = document.getElementById("fire");
var colordict = {"bl":"#666666","r":"#ff00ff","g":"#66ff33","b":"#6633ff"}
var subtitlelist = new Array();
var subword = new Object();
var timercreated = false;
function update(t){
var subwo = document.getElementsByClassName("subword");
if (subtitlelist.length<=0 && timercreated==true)
{
clearInterval(t);
timercreated = false;
}else{
for (var i=0;i<subtitlelist.length;i++)
{
if (subtitlelist[i]["left"] < -parseInt(subwo[i].clientWidth))
{
subtitlelist.splice(i,1);
page1.removeChild(subwo[i]);
}else{
subtitlelist[i]["left"]-=3;
console.log(subtitlelist[i]["left"]);
subwo[i].style.left = subtitlelist[i]["left"]+"px";
}
}
}
}
fire.onclick = function(){
if (timercreated==false)
{
console.log(timercreated);
window.t = setInterval(update,500);
timercreated = true;
}
var colorvalue = document.getElementsByName("color");
if (subtitle.value==null||subtitle.value=="")
{
return;
}else{
if (subtitlelist.length<=50)
{
subword["word"] = subtitle.value;
for (var i=0;i<colorvalue.length;i++)
{
if (colorvalue[i].checked==true)
{
subword["color"] = colordict[colorvalue[i].value];
break;
}
}
subword["left"] = 792;
subword["top"] = parseInt(Math.random()*600)+"px";
subword["iscread"] = false;
subw = document.createElement("span");
subw.className = "subword";
subw.style.color = subword["color"];
subw.innerText = subword["word"];
subw.style.left = subword["left"]+"px";
subw.style.top = subword["top"];
page1.appendChild(subw);
subword["iscread"] = true;
subtitlelist.push(subword);
}else{
alert("弹幕是有上限的，请待会在发");
}
}
}
问题 1、同时发射多个弹幕（2个以上），前面的弹幕“left”会重置，回到屏幕右侧。
2、发射多个时，弹幕的速度好像会叠加。
var subtitle = document.getElementById("subtitle");
var fire = document.getElementById("fire");
var colordict = {"bl":"#666666","r":"#ff00ff","g":"#66ff33","b":"#6633ff"}
var subtitlelist = new Array();
//var subword = new Object();
var timercreated = false;
function update(){//------------不要写t参数
var subwo = document.getElementsByClassName("subword");
if (subtitlelist.length<=0 && timercreated==true)
{
clearInterval(t);
timercreated = false;
}else{
for (var i=0;i<subtitlelist.length;i++)
{
if (subtitlelist[i]["left"] < -parseInt(subwo[i].clientWidth))
{
subtitlelist.splice(i,1);
page1.removeChild(subwo[i]);
}else{
subtitlelist[i]["left"]-=3;
console.log(subtitlelist[i]["left"]);
subwo[i].style.left = subtitlelist[i]["left"]+"px";
}
}
}
}
fire.onclick = function(){
if (timercreated==false)
{
console.log(timercreated);
window.t = setInterval(update,500);
timercreated = true;
}
var colorvalue = document.getElementsByName("color");
if (subtitle.value==null||subtitle.value=="")
{
return;
}else{
if (subtitlelist.length<=50)
{
var subword = new Object();//------每次都要创建新的对象
subword["word"] = subtitle.value;
for (var i=0;i<colorvalue.length;i++)
{
if (colorvalue[i].checked==true)
{
subword["color"] = colordict[colorvalue[i].value];
break;
}
}
subword["left"] = 792;
subword["top"] = parseInt(Math.random()*600)+"px";
subword["iscread"] = false;
subw = document.createElement("span");
subw.className = "subword";
subw.style.color = subword["color"];
subw.innerText = subword["word"];
subw.style.left = subword["left"]+"px";
subw.style.top = subword["top"];
page1.appendChild(subw);
subword["iscread"] = true;
subtitlelist.push(subword);
}else{
alert("弹幕是有上限的，请待会在发");
}
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.shooter{
width: 600px;
height: 60px;
/*background: black;*/
margin: 0 auto;
}
.shooter input{
width: 300px;
height: 40px;
border: none;
border-radius: 7px;
box-shadow: 0 0 8px rgba(182,195,214,0.6)inset;
padding-left: 15px;
margin-top: 10px;
}
.shooter button{
width: 80px;
height: 40px;
border: none;
margin-left: 10px;
background-color:#339B53;
border-radius:8px;
color: white;
cursor: pointer;
}
.shooter button:hover{
font-size: 14px;
background:#008000;
}
.content{
width: 100%;
height: 600px;
background: gray;
position: relative;
overflow: hidden;
}
.bullet{
position: absolute;
/*right: 0;*/
/*left:1600px;*/
word-break: keep-all;
/*不让单词折行*/
}
</style>
<body>
<div class="shooter">
<input type="text"/>
<button>发射</button>
</div>
<div class="content">
</div>
<script type="text/javascript" src="js/jquery-2.0.3.js" ></script>
<script type="text/javascript">
$("button").click(function(){
var msg = $("input").val();
//取出输入框内容
if(msg.length > 15){
alert("字数不得超过15个！");
return;
}
var bullet = $("<div>");
//生成一条弹幕
bullet.text(msg);
//将输入框内容放置到div中
bullet.addClass("bullet");
//为bullet这个div添加样式bullet
bullet.css("top",Math.round(Math.random()*500));
//随机设置弹幕位置
bullet.css("left","1600px");
bullet.css("font-size",Math.round(Math.random()*60)+12+"px");
bullet.css("color","rgb("+Math.round(Math.random()*255)+","+Math.round(Math.random()*255)+","+Math.round(Math.random()*255)+")");
// alert(window.getComputedStyle(bullet,null).width);
bullet.animate({
left:-1000//此处视为bug，应该随着弹幕的长短而变化
},Math.round(Math.random()*9000)+1000,"linear", function(){
bullet.remove();
//当运动结束时，删除弹幕
});
$(".content").append(bullet);
//将弹幕添加到屏幕中
});
</script>
</body>
</html>