javascript - 尝试将此代码包装在命名函数中

Question

这是我试图将其包装在命名函数中的一段代码，但似乎无法弄清楚它是如何完成的。

点击封面后，它们应该不可见。

这是完整的代码:

https://jsfiddle.net/5ny8geL0/

const coversSelector = ".jacket-left, .jacket-middle, .jacket-right";
const covers = document.querySelectorAll(coversSelector);

for (let i = 0; i < covers.length; i += 1) {
    covers[i].addEventListener("click", coverClickHandler);
}

这是剩下的部分。

(function manageCover() {
    "use strict";

    function hide(el) {
        el.classList.add("hide");
    }

    function coverClickHandler(evt) {
        const cover = evt.currentTarget;
        hide(cover);
    }

    const coversSelector = ".jacket-left, .jacket-middle, .jacket-right";
    const covers = document.querySelectorAll(coversSelector);

    for (let i = 0; i < covers.length; i += 1) {
        covers[i].addEventListener("click", coverClickHandler);
    }

}());

我想我需要以某种方式将其转换为 if 语句并将其放入 for 循环中。

const cover = evt.currentTarget;
hide(cover);

或者我正在考虑类似的事情。在 for 循环内添加 if 语句。

for (let i = 0; i < covers.length; i += 1) {
    if (covers[i] !== evt.target) covers[i].hideCovers();
}

const load = (function makeLoad() {
    "use strict";

    function _load(tag) {
        return function (url) {
            return new Promise(function (resolve) {
                const element = document.createElement(tag);
                const parent = "body";
                const attr = "src";
                element.onload = function () {
                    resolve(url);
                };
                element[attr] = url;
                document[parent].appendChild(element);
            });
        };
    }
    return {
        js: _load("script")
    };
}());

(function manageCover() {
    "use strict";

    function hide(el) {
        el.classList.add("hide");
    }

    function coverClickHandler(evt) {
        const cover = evt.currentTarget;
        hide(cover);
    }

    const coversSelector = ".jacket-left, .jacket-middle, .jacket-right";
    const covers = document.querySelectorAll(coversSelector);

    for (let i = 0; i < covers.length; i += 1) {
        covers[i].addEventListener("click", coverClickHandler);
    }

}());

const videoPlayer = (function makeVideoPlayer() {
    "use strict";
    const players = [];

    function onPlayerReady(event) {
        const player = event.target;
        player.setVolume(100); // percent
    }

    let hasShuffled = false;

    function onPlayerStateChange(event) {
        const player = event.target;
        if (!hasShuffled) {
            player.setShuffle(true);
            player.playVideoAt(0);
            hasShuffled = true;
        }
        if (event.data === YT.PlayerState.PLAYING) {
            for (let i = 0; i < players.length; i++) {
                if (players[i] !== event.target) players[i].pauseVideo();
            }
        }

        const playerVars = player.b.b.playerVars;
        if (playerVars.loop && event.data === YT.PlayerState.ENDED) {
            player.seekTo(playerVars.start);
        }
    }

    function addVideo(video, settings) {
        players.push(new YT.Player(video, Object.assign({
            videoId: video.dataset.id,
            host: "https://www.youtube-nocookie.com",
            events: {
                "onReady": onPlayerReady,
                "onStateChange": onPlayerStateChange
            }
        }, settings)));
    }

    function init(video, settings) {
        load.js("https://www.youtube.com/player_api").then(function () {
            YT.ready(function () {
                addVideo(video, settings);
            });
        });
    }
    return {
        init
    };
}());

function loadPlayer(opts) {
    "use strict";

    function show(el) {
        el.classList.remove("hide");
    }

    function initPlayer(wrapper) {
        const video = wrapper.querySelector(".video");
        opts.width = opts.width || 198;
        opts.height = opts.height || 198;
        opts.autoplay = 1;
        opts.controls = 1;
        opts.rel = 0;
        opts.iv_load_policy = 3;
        opts.fs = 0;
        opts.disablekb = 1;

        function paramInOpts(settings, param) {
            if (opts[param] !== undefined) {
                settings[param] = opts[param];
            }
            return settings;
        }
        const settingsParams = ["width", "height", "videoid", "host"];
        const settings = settingsParams.reduce(paramInOpts, {});
        const playerVarsParams = ["autoplay", "cc_load_policy",
            "controls", "disablekb", "end", "fs", "iv_load_policy",
            "list", "listType", "loop", "playlist", "rel", "start"
        ];
        settings.playerVars = playerVarsParams.reduce(paramInOpts, {});
        videoPlayer.init(video, settings);
    }

    function coverClickHandler(evt) {
        const wrapper = evt.currentTarget.nextElementSibling;
        show(wrapper);
        initPlayer(wrapper);
    }
    const cover = document.querySelector(opts.target);
    cover.addEventListener("click", coverClickHandler);
}
const playlist = "0dgNc5S8cLI,mnfmQe8Mv1g,-Xgi_way56U,CHahce95B1g";

loadPlayer({
    target: ".jacket-left",
    width: 277,
    height: 207
});

loadPlayer({
    target: ".jacket-middle",
    width: 277,
    height: 207
});
loadPlayer({
    target: ".jacket-right",
    width: 277,
    height: 207
});


loadPlayer({
    target: ".jacketc",
    width: 600,
    height: 338,
    loop: true,
    playlist
});
loadPlayer({
    target: ".alpha",
    start: 0,
    end: 280,
    loop: true
});
loadPlayer({
    target: ".beta",
    start: 0,
    end: 240,
    loop: true
});
loadPlayer({
    target: ".gamma",
    start: 0,
    end: 265,
    loop: true
});
loadPlayer({
    target: ".delta",
    start: 4,
    end: 254,
    loop: true
});
loadPlayer({
    target: ".epsilon",
    start: 0,
    end: 242,
    loop: true
});
loadPlayer({
    target: ".zeta",
    start: 0,
    end: 285,
    loop: true
});
loadPlayer({
    target: ".eta",
    start: 23,
    end: 312,
    loop: true
});
loadPlayer({
    target: ".theta",
    start: 2
});
loadPlayer({
    target: ".iota"
});

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  background: #353198;
}

.outer {
  display: table;
  height: 100%;
  margin: 0 auto;
}

.tcell {
  display: table-cell;
  vertical-align: middle;
}

.container {
  width: 936px;
  padding: 25px;
  margin: 100px auto;
  border-radius: 25px;
  border: 2px solid #0059dd;
  background: #000000;
}

.container-top {
  position: relative;
  height: 310px;
  margin: 0;
  /* was margin: 0 0 45px 0 - why the 45px bottom margin ? */
  border-radius: 25px;
  border: 3px solid #0059dd;
  box-sizing: border-box;
  background: url("https://i.imgur.com/jEMIULl.jpg") no-repeat 0 0;
  background-size: cover;
}

/*
.container-left-video, 
.container-middle-video, 
.container-right-video {
*/
.v-contain {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
  float: left;
  margin-left: 25px;
  width: 277px;
  background: red;
  border-radius: 25px;
}

/*
.container-left-video .jacket-left, 
.container-middle-video .jacket-middle, 
.container-right-video .jacket-right {
*/
.jacket {
  position: relative;
  width: 80px;
  height: 80px;
  margin: auto;
  background: url("https://i.imgur.com/fzdYu8g.jpg") no-repeat 0 0;
  background-size: 100% 200%;
}

/*.container-middle-video .jacket-middle {*/
.jacket-middle {
  background-position: 0 -80px;
  background-size: 100% 200%;
}

/*.container-right-video .jacket-right {*/
.jacket-right {
  background-position: 0 -80px;
  background-size: 100% 200%;
}

/*
.container-left-video .jacket-left .circle, 
.container-middle-video .jacket-middle .circle, 
.container-right-video .jacket-right .circle {
*/
.circle {
  position: absolute;
  top: 25%;
  left: 25%;
  width: 50%;
  height: 50%;
  box-sizing: border-box;
  border: 1px solid #0059dd;
  border-radius: 50%;
  cursor: pointer;
  background: rgba(0, 0, 0, 0.5);
  transition: transform 0.1s ease 0s;
  box-shadow: rgba(0, 0, 0, 0.4) 0 0 10px;
}

/*
.container-left-video .jacket-left .play, 
.container-middle-video .jacket-middle .play, 
.container-right-video .jacket-right .play {
*/
.play {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  width: 38px;
  height: 22px;
  fill: #0059dd;
}

/*
.container-left-video .jacket-left .circle:hover, 
.container-middle-video .jacket-middle .circle:hover, 
.container-right-video .jacket-right .circle:hover {
*/
.circle:hover {
  border: 1px solid red;
  transform: scale(1.1);
}

/*
.container-left-video .jacket-left .circle:hover .play, 
.container-middle-video .jacket-middle .circle:hover .play, 
.container-right-video .jacket-right .circle:hover .play {
*/
.circle:hover .play {
  fill: red;
}

/*
.container-left-video .wrap-left, 
.container-middle-video .wrap-middle, 
.container-right-video .wrap-right {
*/
.wrap {
  position: relative;
  width: 277px;
  height: 207px;
  cursor: pointer;
  overflow: hidden;
  border-radius: 25px;
}

/*
.container-left-video .wrap-left iframe, 
.container-middle-video .wrap-middle iframe, 
.container-right-video .wrap-right iframe {
*/
.wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 277px;
  height: 207px;
  cursor: pointer;
}

.hide {
  display: none;
}

<div class="outer">
  <div class="tcell">
    <div class="container ">
      <div class="container-top">
        <div class="v-contain container-left-video">
          <div class="jacket jacket-left">
            <div class="circle"> <svg class="play" width="38" height="22" viewBox="0 0 26 26">
                <title>Play</title>
                <path d="M7.712 22.04a.732.732 0 0 1-.806.007.767.767 0 0 1-.406-.703V4.656c0-.31.135-.544.406-.703.271-.16.54-.157.806.006l14.458 8.332c.266.163.4.4.4.709 0 .31-.134.546-.4.71L7.712 22.04z" fill-rule="evenodd" />
              </svg> </div>
          </div>
          <div class="wrap wrap-left hide">
            <div class="video" data-id="jMAShwisnQI"></div>
          </div>
        </div>
        <div class="v-contain container-middle-video">
          <div class="jacket jacket-middle">
            <div class="circle"> <svg class="play" width="38" height="22" viewBox="0 0 26 26">
                <title>Play</title>
                <path d="M7.712 22.04a.732.732 0 0 1-.806.007.767.767 0 0 1-.406-.703V4.656c0-.31.135-.544.406-.703.271-.16.54-.157.806.006l14.458 8.332c.266.163.4.4.4.709 0 .31-.134.546-.4.71L7.712 22.04z" fill-rule="evenodd" />
              </svg> </div>
          </div>
          <div class="wrap wrap-middle hide">
            <div class="video" data-id="-SiGnAi845o"></div>
          </div>
        </div>
        <div class="v-contain container-right-video">
          <div class="jacket jacket-right">
            <div class="circle"> <svg class="play" width="38" height="22" viewBox="0 0 26 26">
                <title>Play</title>
                <path d="M7.712 22.04a.732.732 0 0 1-.806.007.767.767 0 0 1-.406-.703V4.656c0-.31.135-.544.406-.703.271-.16.54-.157.806.006l14.458 8.332c.266.163.4.4.4.709 0 .31-.134.546-.4.71L7.712 22.04z" fill-rule="evenodd" />
              </svg> </div>
          </div>
          <div class="wrap wrap-right hide">
            <div class="video" data-id="-SiGnAi845o"></div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

Answer 1

如何执行此操作取决于您想要在函数中注入(inject)多少信息以及想要将多少信息作为参数传递给函数。

如果您将所有信息放入其中，您实际上只需将这些语句放入同一位置的函数中(因此它会通过 coverClickHandler 关闭)，这样就可以工作:

(function manageCover() {
    "use strict";

    function hide(el) {
        el.classList.add("hide");
    }

    function coverClickHandler(evt) {
        const cover = evt.currentTarget;
        hide(cover);
    }

    function hookUpHandlers() {
        const coversSelector = ".jacket-left, .jacket-middle, .jacket-right";
        const covers = document.querySelectorAll(coversSelector);

        for (let i = 0; i < covers.length; i += 1) {
            covers[i].addEventListener("click", coverClickHandler);
        }
    }

    hookUpHandlers();
}());

不过，这没有多大意义。

如果您想要一个可以将选择器和处理程序传递给的通用函数，您可以这样做:

function hookUpClickHandlers(selector, handler) {
    const list = document.querySelectorAll(coversSelector);
    for (let i = 0; i < list.length; i += 1) {
        list[i].addEventListener("click", handler);
    }
}

(function manageCover() {
    "use strict";

    function hide(el) {
        el.classList.add("hide");
    }

    function coverClickHandler(evt) {
        const cover = evt.currentTarget;
        hide(cover);
    }

    hookUpClickHandlers(".jacket-left, .jacket-middle, .jacket-right", coverClickHandler);
}());

如果您还想参数化事件名称，也可以这样做:

function hookUpHandlers(selector, eventName, handler) {
    const list = document.querySelectorAll(coversSelector);
    for (let i = 0; i < list.length; i += 1) {
        list[i].addEventListener(eventName, handler);
    }
}

(function manageCover() {
    "use strict";

    function hide(el) {
        el.classList.add("hide");
    }

    function coverClickHandler(evt) {
        const cover = evt.currentTarget;
        hide(cover);
    }

    hookUpHandlers(".jacket-left, .jacket-middle, .jacket-right", "click", coverClickHandler);
}());