Home  >  Article  >  Web Front-end  >  Use JavaScript and jQuery knowledge to achieve interesting barrage effects

Use JavaScript and jQuery knowledge to achieve interesting barrage effects

清浅
清浅Original
2018-11-13 16:29:472150browse

This article will share with you an interesting case---barrage publishing, using CSS, JavaScript, jQuery and other knowledge points to implement this function

Case :Barrage release【JavaScript Tutorial】【jQuery Tutorial】

Essential knowledge points:

(1)随机数产生:var demo=parseInt(Math.random()*500)
(2)获取一个元素的值:$("demo").val();
(3)给某个元素增加文本值:$("demo").text($("text").val())
(4)清空元素的值:$("demo").val("")
(5)jquery中animate属性:
$(dem).animate({params},speed,callback
必需的 params 参数定义形成动画的 CSS 属性。
可选的 speed 参数规定效果的时长。它可以取以下值:"slow"、"fast" 或毫秒。
可选的 callback 参数是动画完成后所执行的函数名称。

Code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>弹幕</title>
    <style>
    body{
   background-color:rgb(129,228,247);

    }
    .box1{
           width:100%;
           height:100%;
           position: absolute;
           bottom:-50px;
        }
   .box2{
        width:800px;
        position: absolute;
        height:100px;
        border:1px solid #ccc;
        background-color:rgb(164,204,178);
        bottom:50px;
        left:30%;
    }
    p{
        width:100px;
        height:50px;
        position: absolute;
        left:200px;
        top:1px;
        font-size:30px;
        color:pink;
    }
    .input{
        width:200px;
        height:30px;
        border:1px solid rgb(71, 224, 217);
        position: absolute;
        left:300px;
        top:34px;
    }
    .btn{
        width:60px;
        height:30px;
        position: absolute;
        left:520px;
        top:35px;
        background-color:rgb(17,150,225);
        color:#fff;
    }
    span{
      width: 300px;
      height: 140px;
      position: absolute;
      overflow: hidden;
      color: #000;
      font-size: 4em;
      line-height: 1.5em;
      cursor: pointer;
      white-space: nowrap;
    }
    </style>
     <script src="jquery/jquery-1.12.4.js"></script>
    <script>
    $(function(){
        var colors=["black","pink","hotpink","blue","yellow"];//颜色数组,随机色从中产生
        $(".btn").click(function(){
            var radomColors=parseInt(Math.random() * colors.length);//随机颜色
            var radomY=parseInt(Math.random()*500);//弹幕出现的随机高度
            $("<span></span>").text($(".input").val())//创建一个span并且给他input值
           .css("color",colors[radomColors]) //给样式增加随机生成的颜色
            .css("left",1200)//设置left值,弹幕从哪儿开始
            .css("top",radomY)//设置top
            .animate({left:-500},5000,function(){
                $(this).remove();}//让字体按5000毫秒的速度向左移动移动
            ).appendTo(".box1");
            $(".input").val("");
        });
    });</script>
</head>
<body>
    <div class="box1">
    <div class="box2">
       <p> 吐槽:</p><input type="text" class="input">
        <button value="发射" class="btn">发射</button>   
    </div>
</div>  
</body>
</html>

Rendering:

Image 14.jpgSummary: The above is the main content of this article. I hope that through this case, you can consolidate and review what you have learned about js and jQuery



The above is the detailed content of Use JavaScript and jQuery knowledge to achieve interesting barrage effects. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn