动画队列.html

<!DOCTYPE html>
<html lang="en">
<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>Document</title>
    <style>
            .box {
              width: 100px;
              height: 100px;
              background-color: green;
              position: absolute;
            }
          </style>
</head>
<body>
        <input type="button" value="开始" id="btn1">
        <input type="button" value="停止" id="btn2">
      <div class="box"></div>
</body>
</html>
<script src="../03 - 代码/jquery/jquery-2.2.2.js"></script>
<script>
let btn = $('#btn1');
btn.on('click',function(){
    $('.box').animate({width:300,height:300},3000);
})
$('#btn2').on('click',function(){
    $('.box').stop(true,false);
})
</script>