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      <a href="../../index.html">all files</a> / <a href="index.html">src/scroll/</a> event.js
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        <span class="strong">96.43% </span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { spliceOne } from '../util/spliceOne'
&nbsp;
export function eventMixin(BScroll) {
  BScroll.prototype.on = function (type, fn, context = this) {
    if (!this._events[type]) {
      this._events[type] = []
    }
&nbsp;
    this._events[type].push([fn, context])
  }
&nbsp;
  BScroll.prototype.once = function (type, fn, context = this) {
    function magic() {
      this.off(type, magic)
&nbsp;
      fn.apply(context, arguments)
    }
    // To expose the corresponding function method in order to execute the off method
    magic.fn = fn
&nbsp;
    this.on(type, magic)
  }
&nbsp;
  BScroll.prototype.off = function (type, fn) {
    let _events = this._events[type]
    <span class="missing-if-branch" title="if path not taken" >I</span>if (!_events) {
<span class="cstat-no" title="statement not covered" >      return</span>
    }
&nbsp;
    let count = _events.length
    while (count--) {
      if (_events[count][0] === fn || (_events[count][0] &amp;&amp; _events[count][0].fn === fn)) {
        spliceOne(_events, count)
      }
    }
  }
&nbsp;
  BScroll.prototype.trigger = function (type) {
    let events = this._events[type]
    if (!events) {
      return
    }
&nbsp;
    let len = events.length
    let eventsCopy = [...events]
    for (let i = 0; i &lt; len; i++) {
      let event = eventsCopy[i]
      let [fn, context] = event
      <span class="missing-if-branch" title="else path not taken" >E</span>if (fn) {
        fn.apply(context, [].slice.call(arguments, 1))
      }
    }
  }
}
&nbsp;</pre></td></tr>
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