关于javascript:h5-实现播放功能

利用 html + js + css 实现一个播放器的简略性能

咱们在页面开发过程中会遇到，在页面中播放视频的需要。通常咱们利用成熟的 视频播放插件来解决

如: video.js。然而，为了咱们的个人成长，也须要理解下如何实现一个简略的 h5 播放器性能。

要实现一个播放性能通常包含：

1. video 标签的应用
2. 模仿视频进度条
3. 管制播放和暂停
4. 管制音量
5. 快进和回退

布局

<div class="player">
      <video src="./video.mp4" class="player_video"></video>
      <div class="player_controls">
        <div class="progress">
          <div class="progress_fill"></div>
        </div>
        <button class="player_button toggle" title="Toggle Play">►</button>
        <input
          type="range"
          class="player_range"
          name="playbackRate"
          min="0.5"
          max="2"
          step="0.1"
          value="1"
        />
        <button data-skip="-10" class="player_button">« 10s</button>
        <button data-skip="25" class="player_button">25s »</button>
      </div>
</div>

款式

// .scss
html {box-sizing: border-box;}

*,
*:before,
*:after {box-sizing: inherit;}

body {
  background: #fff;
  min-height: 100vh;
  background-size: cover;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
}
.player {
  width: 750px;
  border: 2px solid #000;
  position: relative;
  font-size: 0;
  overflow: hidden;
  .player_video {width: 100%;}
  &:fullscreen {
    max-width: none;
    width: 100%;
  }
  &:-webkit-full-screen {
    max-width: none;
    width: 100%;
  }
  &:hover .progress {height: 15px;}
  &:hover .player_controls {transform: translateY(0);
  }
}
.player_controls {
  display: flex;
  position: absolute;
  bottom: 0;
  width: 100%;
  transform: translateY(100%) translateY(-5px);
  transition: all 0.3s;
  flex-wrap: wrap;
  background: rgba(0, 0, 0, 0.7);
  & > * {flex: 1;}
  .player_button {
    background: none;
    border: 0;
    outline: none;
    line-height: 1;
    color: #fff;
    text-align: center;
    padding: 0;
    cursor: pointer;
    max-width: 50px;
    &:focus {border-color: #ffc600;}
  }
  .player_range {
    width: 10px;
    height: 30px;
  }
  .progress {
    flex: 10;
    position: relative;
    display: flex;
    flex-basis: 100%;
    height: 5px;
    transition: height 0.3s;
    background: rgba(0, 0, 0, 0.5);
    cursor: ew-resize;
    .progress_fill {
      // width: 10%;
      background: #ffc600;
      flex: 0;
      flex-basis: 10%;
    }
  }
}
// 进度条
input[type='range'] {
  -webkit-appearance: none;
  background: transparent;
  width: 100%;
  margin: 0 5px;
  &:focus {outline: none;}
  &::-webkit-slider-runnable-track {
    width: 100%;
    height: 8.4px;
    cursor: pointer;
    box-shadow: 1px 1px 1px rgba(0, 0, 0, 0), 0 0 1px rgba(13, 13, 13, 0);
    background: rgba(255, 255, 255, 0.8);
    border-radius: 1.3px;
    border: 0.2px solid rgba(1, 1, 1, 0);
  }

  &::-webkit-slider-thumb {
    height: 15px;
    width: 15px;
    border-radius: 50px;
    background: #ffc600;
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -3.5px;
    box-shadow: 0 0 2px rgba(0, 0, 0, 0.2);
  }

  &:focus::-webkit-slider-runnable-track {background: #bada55;}

  &::-moz-range-track {
    width: 100%;
    height: 8.4px;
    cursor: pointer;
    box-shadow: 1px 1px 1px rgba(0, 0, 0, 0), 0 0 1px rgba(13, 13, 13, 0);
    background: #ffffff;
    border-radius: 1.3px;
    border: 0.2px solid rgba(1, 1, 1, 0);
  }

  &::-moz-range-thumb {box-shadow: 0 0 0 rgba(0, 0, 0, 0), 0 0 0 rgba(13, 13, 13, 0);
    height: 15px;
    width: 15px;
    border-radius: 50px;
    background: #ffc600;
    cursor: pointer;
  }
}

脚本

 const player = document.querySelector('.player');
 const video = document.querySelector('.player_video');
 const toggle = document.querySelector('.toggle');

 // 播放 or 暂停
 function toggleVideo() {
 const methods = video.paused ? 'play' : 'pause';
 video[methods]();}
 function updateButton() {
 const image = this.paused ? '►' : '❚ ❚';
 toggle.textContent = image;
 }

// 管制播放
video.addEventListener('click', toggleVideo);
video.addEventListener('play', updateButton);
video.addEventListener('pause', updateButton);
toggle.addEventListener('click', toggleVideo);

总结

1. 学习了 input[type=”range”] 来模仿进度条
2. 温习了 js 管制拖动
3. 温习了 flex 根底