js缓动效果

2019-07-07 15:01:05 作者：互联网

<!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>
    ul {
      width: 1200px;
      text-align: center;
      display: inline-flex;
      margin-top: 200px;
    }

    li {
      list-style: none;
      width: 40px;
      height: 60px;
      background: skyblue;
      color: #fff;
      float: left;
      display: flex;
      justify-content: center;
      align-items: center;
      transition: transform .2s;
      transition: width .6s;
    }
    li.active {
      background: red;
      width: 100px;
    }
  </style>
</head>

<body>


  <script>
    eventUntil = {

      addEvent: function (element, type, handler) {
        if (element.addEventListener) {
          //事件类型、需要执行的函数、是否捕捉
          element.addEventListener(type, handler, false);
        } else if (element.attachEvent) {
          element.attachEvent('on' + type, function () {
            handler.call(element);
          });
        } else {
          element['on' + type] = handler;
        }
      }
    };


    class MusiceJuip {
      juip_el() {
        function tiao() {
          return new Promise((resolve, reject) => {
            let add_el = {
              parent_el: document.querySelector('body'),
              ul_el: document.createElement('ul'),
              num: 10,
              juip_num: -10,
              init_num: 0,
              juipTime : 700,
              creat_el: function () {
                const _THIS_ = this;
                _THIS_.parent_el.append(_THIS_.ul_el);
                for (let i = 1; i <= _THIS_.num; i++) {
                  let li_el = document.createElement('li');
                  li_el.innerText = i;
                  _THIS_.ul_el.append(li_el);
                }
                // 循环跳动
                let ul_childnodes = document.querySelector('ul').getElementsByTagName('li');
                for (let i = 0; i < ul_childnodes.length; i++) {
                  eventUntil.addEvent(ul_childnodes[i], 'click', clickJuip);
                  function clickJuip() {
                    for (let i = 0; i < ul_childnodes.length; i++) {
                      ul_childnodes[i].style.transform = `translate(${_THIS_.init_num},${_THIS_.init_num}px)`;
                      ul_childnodes[i].className = "";
                    }
                    this.style.transform = `translate(${_THIS_.init_num},${_THIS_.juip_num}px)`;
                    this.className = "active"; 
                  }
                }

                let index = -1;
                function time_juip() {
                  index++;
                  index == 10 ? index = -1 : (
                    new function () {
                      for (let i = 0; i < ul_childnodes.length; i++) {
                        ul_childnodes[i].style.transform = `translate(${_THIS_.init_num},${_THIS_.init_num}px)`;
                        ul_childnodes[i].className = "";
                      }
                      switch (index) {
                        case index:
                          ul_childnodes[index].style.transform = `translate(${_THIS_.init_num},${_THIS_.juip_num * (index + 2)}px)`;
                          ul_childnodes[index].className = "active";
                          break;
                      }
                    }
                  )
                }
                setInterval(time_juip, this.juipTime);
              }
            }
            add_el.creat_el();

            document.querySelector('ul') ? resolve() : reject();

          })
        }

        async function Jus() {
          await tiao().then(() => {
            console.log('程序运行成功');
          }).catch(() => {
            console.log('程序运行失败！');
          })
        }
        Jus();

      }
    }
    const JUIP = new MusiceJuip();
    JUIP.juip_el();
  </script>


</body>

</html>
标签：function,el,效果,handler,element,width,缓动,js,type
来源： https://blog.csdn.net/qq_38161537/article/details/94990662