Wake Lock API 個案研究：BettyCrocker.com 上的購買意願指標提升了 300%

// The wake lock sentinel.
let wakeLock = null;

// Function that attempts to request a wake lock.
const requestWakeLock = async () => {
  try {
    wakeLock = await navigator.wakeLock.request('screen');
    wakeLock.addEventListener('release', () => {
      console.log('Wake Lock was released');
    });
    console.log('Wake Lock is active');
  } catch (err) {
    console.error(`${err.name}, ${err.message}`);
  }
};

// Request a wake lock…
await requestWakeLock();
// …and release it again after 5s.
window.setTimeout(() => {
  wakeLock.release();
  wakeLock = null;
}, 5000);

var wakeLockControl = () => {
  return import(/* webpackChunkName: 'wakeLock' */ './wakeLock');
};

export default {
  components: {
    wakeLockControl: wakeLockControl,
  },
  data() {
    return {
      config: {},
      wakeLockComponent: '',
    };
  },
  methods: {
    init: function(config) {
      this.config = config || {};
      if ('wakeLock' in navigator && 'request' in navigator.wakeLock) {
        this.wakeLockComponent = 'wakeLockControl';
      } else {
        console.log('Browser not supported');
      }
    },
  },
};

<template>
  <div class="wakeLock">
    <div class="textAbove"></div>
    <label class="switch" :aria-label="settingsInternal.textAbove">
      <input type="checkbox" @change="onChange()" v-model="isChecked">
      <span class="slider round"></span>
    </label>
  </div>
</template>

<script type="text/javascript">
  import debounce from 'lodash.debounce';

  const scrollDebounceMs = 1000;

  export default {
    props: {
      settings: { type: Object },
    },
    data() {
      return {
        settingsInternal: this.settings || {},
        isChecked: false,
        wakeLock: null,
        timerId: 0,
      };
    },
    created() {
      this.$_raiseAnalyticsEvent('Wake Lock Toggle Available');
    },
    methods: {
      onChange: function() {
        if (this.isChecked) {
          this.$_requestWakeLock();
        } else {
          this.$_releaseWakeLock();
        }
      },
      $_requestWakeLock: async function() {
        try {
          this.wakeLock = await navigator.wakeLock.request('screen');
          //Start new timer
          this.$_handleAbortTimer();
          //Only add event listeners after wake lock is successfully enabled
          document.addEventListener(
            'visibilitychange',
            this.$_handleVisibilityChange,
          );
          window.addEventListener(
            'scroll',
            debounce(this.$_handleAbortTimer, scrollDebounceMs),
          );
          this.$_raiseAnalyticsEvent('Wake Lock Toggle Enabled');
        } catch (e) {
          this.isChecked = false;
        }
      },
      $_releaseWakeLock: function() {
        try {
          this.wakeLock.release();
          this.wakeLock = null;
          //Clear timer
          this.$_handleAbortTimer();
          //Clean up event listeners
          document.removeEventListener(
            'visibilitychange',
            this.$_handleVisibilityChange,
          );
          window.removeEventListener(
            'scroll',
            debounce(this.$_handleAbortTimer, scrollDebounceMs),
          );
        } catch (e) {
          console.log(`Wake Lock Release Error: ${e.name}, ${e.message}`);
        }
      },
      $_handleAbortTimer: function() {
        //If there is an existing timer then clear it and set to zero
        if (this.timerId !== 0) {
          clearTimeout(this.timerId);
          this.timerId = 0;
        }
        //Start new timer; Will be triggered from toggle enabled or scroll event
        if (this.isChecked) {
          this.timerId = setTimeout(
            this.$_releaseWakeLock,
            this.settingsInternal.timeoutDurationMs,
          );
        }
      },
      $_handleVisibilityChange: function() {
        //Handle navigating away from page/tab
        if (this.isChecked) {
          this.$_releaseWakeLock();
          this.isChecked = false;
        }
      },
      $_raiseAnalyticsEvent: function(eventType) {
        let eventParams = {
          EventType: eventType,
          Position: window.location.pathname || '',
        };
        Analytics.raiseEvent(eventParams);
      },
    },
  };
</script>