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如何在类中放置函数？

分类：编程问答

如何解决如何在类中放置函数？

我正在使用 ion.RangeSliders，我需要初始化大约 10 个滑块。所以我决定使用 JavaScript 类的构造函数方法。

这就是我所做的：

$(document).ready(function () {
  var table = $("#example").DataTable();

  class IonRangeWrapper {
    constructor(range,min,max,inputFrom,inputTo) {
      range.ionRangeSlider({
        type: "double",min: min,max: max,from: min,to: max,onStart: updateInputs,onFinish: updateInputs
      });
      var instance = range.data("ionRangeSlider");

      inputFrom.on("input",function () {
        var val = $(this).prop("value");
        if (val < min) { val = min; }
        else if (val > to) { val = to; }
        instance.update({ from: val });
      });

      inputTo.on("input",function () {
        var val = $(this).prop("value");
        if (val < from) { val = from; }
        else if (val > max) { val = max; }
        instance.update({ to: val });
      });
    }
  }

  function updateInputs(data) {
    from = data.from;
    to = data.to;
    inputFromAge.prop("value",from);
    inputToAge.prop("value",to);
    table.draw();
  }
  
  // Age Slider
  var rangeAge = $(".rangeAge");
  var inputFromAge = $(".inputFromAge");
  var inputToAge = $(".inputToAge");
  var minAge = 10;
  var maxAge = 70;

  new IonRangeWrapper(rangeAge,minAge,maxAge,inputFromAge,inputToAge);
  
  // Event listener to the two range filtering inputs to redraw on input
  $("#minAge,#maxAge").keyup(function () {
    table.draw();
  });
});

/* Custom filtering function which will search data in column four between two values */
$.fn.dataTable.ext.search.push(function (settings,data,dataIndex) {
  var minAge = parseInt($("#minAge").val(),10);
  var maxAge = parseInt($("#maxAge").val(),10);
  var age = parseFloat(data[3]) || 0; // use data for the age column

  if (
    (isNaN(minAge) && isNaN(maxAge)) ||
    (isNaN(minAge) && age <= maxAge) ||
    (minAge <= age && isNaN(maxAge)) ||
    (minAge <= age && age <= maxAge)
  ) {
    return true;
  }
  return false;
});
body {
  font: 90%/1.45em "Helvetica Neue",HelveticaNeue,Verdana,Arial,Helvetica,sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #fff;
}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.3.1/css/ion.rangeSlider.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.3.1/js/ion.rangeSlider.min.js"></script>
<link href="https://nightly.datatables.net/css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
<script src="https://nightly.datatables.net/js/jquery.dataTables.js"></script>


<div class="container">

  <h4 style="text-align: center; margin-bottom:0;">Age Filter</h4>
  <div style="display: flex; margin: 10px;">
    <div>
      <input type="text" size="4" class="inputFromAge" id="minAge" name="minAge" value="0" />
    </div>
    <div style="flex-grow: 1; padding: 0 10px;">
      <input type="text" class="rangeAge" value="" />
    </div>
    <div>
      <input type="text" size="4" class="inputToAge" id="maxAge" name="maxAge" value="0" />
    </div>
  </div>
  <hr>

  <table id="example" class="display" style="width:100%">
    <thead>
      <tr>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Tiger Nixon</td>
        <td>System Architect</td>
        <td>Edinburgh</td>
        <td>61</td>
        <td>2011/04/25</td>
        <td>$320,800</td>
      </tr>
      <tr>
        <td>Garrett Winters</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>63</td>
        <td>2011/07/25</td>
        <td>$170,750</td>
      </tr>
      <tr>
        <td>Ashton Cox</td>
        <td>Junior Technical Author</td>
        <td>San Francisco</td>
        <td>66</td>
        <td>2009/01/12</td>
        <td>$86,000</td>
      </tr>
      <tr>
        <td>Cedric Kelly</td>
        <td>Senior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2012/03/29</td>
        <td>$433,060</td>
      </tr>
      <tr>
        <td>Airi Satou</td>
        <td>Accountant</td>
        <td>Tokyo</td>
        <td>33</td>
        <td>2008/11/28</td>
        <td>$162,700</td>
      </tr>
      <tr>
        <td>Brielle Williamson</td>
        <td>Integration Specialist</td>
        <td>New York</td>
        <td>61</td>
        <td>2012/12/02</td>
        <td>$372,000</td>
      </tr>
      <tr>
        <td>Herrod Chandler</td>
        <td>Sales Assistant</td>
        <td>San Francisco</td>
        <td>59</td>
        <td>2012/08/06</td>
        <td>$137,500</td>
      </tr>
      <tr>
        <td>Rhona Davidson</td>
        <td>Integration Specialist</td>
        <td>Tokyo</td>
        <td>55</td>
        <td>2010/10/14</td>
        <td>$327,900</td>
      </tr>
      <tr>
        <td>Colleen Hurst</td>
        <td>Javascript Developer</td>
        <td>San Francisco</td>
        <td>39</td>
        <td>2009/09/15</td>
        <td>$205,500</td>
      </tr>
      <tr>
        <td>Sonya Frost</td>
        <td>Software Engineer</td>
        <td>Edinburgh</td>
        <td>23</td>
        <td>2008/12/13</td>
        <td>$103,600</td>
      </tr>
      <tr>
        <td>Jena Gaines</td>
        <td>Office Manager</td>
        <td>London</td>
        <td>30</td>
        <td>2008/12/19</td>
        <td>$90,560</td>
      </tr>
      <tr>
        <td>Quinn Flynn</td>
        <td>Support Lead</td>
        <td>Edinburgh</td>
        <td>22</td>
        <td>2013/03/03</td>
        <td>$342,000</td>
      </tr>
      <tr>
        <td>Charde Marshall</td>
        <td>Regional Director</td>
        <td>San Francisco</td>
        <td>36</td>
        <td>2008/10/16</td>
        <td>$470,600</td>
      </tr>
      <tr>
        <td>Haley Kennedy</td>
        <td>Senior Marketing Designer</td>
        <td>London</td>
        <td>43</td>
        <td>2012/12/18</td>
        <td>$313,500</td>
      </tr>
      <tr>
        <td>Tatyana Fitzpatrick</td>
        <td>Regional Director</td>
        <td>London</td>
        <td>19</td>
        <td>2010/03/17</td>
        <td>$385,750</td>
      </tr>
      <tr>
        <td>Michael Silva</td>
        <td>Marketing Designer</td>
        <td>London</td>
        <td>66</td>
        <td>2012/11/27</td>
        <td>$198,500</td>
      </tr>
      <tr>
        <td>Paul Byrd</td>
        <td>Chief Financial Officer (CFO)</td>
        <td>New York</td>
        <td>64</td>
        <td>2010/06/09</td>
        <td>$725,000</td>
      </tr>
      <tr>
        <td>Gloria Little</td>
        <td>Systems Administrator</td>
        <td>New York</td>
        <td>59</td>
        <td>2009/04/10</td>
        <td>$237,500</td>
      </tr>
      <tr>
        <td>Bradley Greer</td>
        <td>Software Engineer</td>
        <td>London</td>
        <td>41</td>
        <td>2012/10/13</td>
        <td>$132,000</td>
      </tr>
      <tr>
        <td>Dai Rios</td>
        <td>Personnel Lead</td>
        <td>Edinburgh</td>
        <td>35</td>
        <td>2012/09/26</td>
        <td>$217,500</td>
      </tr>
      <tr>
        <td>Jenette Caldwell</td>
        <td>Development Lead</td>
        <td>New York</td>
        <td>30</td>
        <td>2011/09/03</td>
        <td>$345,000</td>
      </tr>
      <tr>
        <td>Yuri Berry</td>
        <td>Chief Marketing Officer (CMO)</td>
        <td>New York</td>
        <td>40</td>
        <td>2009/06/25</td>
        <td>$675,000</td>
      </tr>
      <tr>
        <td>Caesar Vance</td>
        <td>Pre-Sales Support</td>
        <td>New York</td>
        <td>21</td>
        <td>2011/12/12</td>
        <td>$106,450</td>
      </tr>
      <tr>
        <td>Doris Wilder</td>
        <td>Sales Assistant</td>
        <td>Sydney</td>
        <td>23</td>
        <td>2010/09/20</td>
        <td>$85,600</td>
      </tr>
      <tr>
        <td>Angelica Ramos</td>
        <td>Chief Executive Officer (CEO)</td>
        <td>London</td>
        <td>47</td>
        <td>2009/10/09</td>
        <td>$1,200,000</td>
      </tr>
      <tr>
        <td>Gavin Joyce</td>
        <td>Developer</td>
        <td>Edinburgh</td>
        <td>42</td>
        <td>2010/12/22</td>
        <td>$92,575</td>
      </tr>
      <tr>
        <td>Jennifer Chang</td>
        <td>Regional Director</td>
        <td>Singapore</td>
        <td>28</td>
        <td>2010/11/14</td>
        <td>$357,650</td>
      </tr>
      <tr>
        <td>Brenden Wagner</td>
        <td>Software Engineer</td>
        <td>San Francisco</td>
        <td>28</td>
        <td>2011/06/07</td>
        <td>$206,850</td>
      </tr>
      <tr>
        <td>Fiona Green</td>
        <td>Chief Operating Officer (COO)</td>
        <td>San Francisco</td>
        <td>48</td>
        <td>2010/03/11</td>
        <td>$850,000</td>
      </tr>
      <tr>
        <td>Shou Itou</td>
        <td>Regional Marketing</td>
        <td>Tokyo</td>
        <td>20</td>
        <td>2011/08/14</td>
        <td>$163,000</td>
      </tr>
      <tr>
        <td>Michelle House</td>
        <td>Integration Specialist</td>
        <td>Sydney</td>
        <td>37</td>
        <td>2011/06/02</td>
        <td>$95,400</td>
      </tr>
      <tr>
        <td>Suki Burks</td>
        <td>Developer</td>
        <td>London</td>
        <td>53</td>
        <td>2009/10/22</td>
        <td>$114,500</td>
      </tr>
      <tr>
        <td>Prescott Bartlett</td>
        <td>Technical Author</td>
        <td>London</td>
        <td>27</td>
        <td>2011/05/07</td>
        <td>$145,000</td>
      </tr>
      <tr>
        <td>Gavin Cortez</td>
        <td>Team leader</td>
        <td>San Francisco</td>
        <td>22</td>
        <td>2008/10/26</td>
        <td>$235,500</td>
      </tr>
      <tr>
        <td>martena Mccray</td>
        <td>Post-Sales support</td>
        <td>Edinburgh</td>
        <td>46</td>
        <td>2011/03/09</td>
        <td>$324,050</td>
      </tr>
      <tr>
        <td>Unity Butler</td>
        <td>Marketing Designer</td>
        <td>San Francisco</td>
        <td>47</td>
        <td>2009/12/09</td>
        <td>$85,675</td>
      </tr>
      <tr>
        <td>Howard Hatfield</td>
        <td>Office Manager</td>
        <td>San Francisco</td>
        <td>51</td>
        <td>2008/12/16</td>
        <td>$164,500</td>
      </tr>
      <tr>
        <td>Hope Fuentes</td>
        <td>Secretary</td>
        <td>San Francisco</td>
        <td>41</td>
        <td>2010/02/12</td>
        <td>$109,850</td>
      </tr>
      <tr>
        <td>Vivian Harrell</td>
        <td>Financial Controller</td>
        <td>San Francisco</td>
        <td>62</td>
        <td>2009/02/14</td>
        <td>$452,500</td>
      </tr>
      <tr>
        <td>Timothy Mooney</td>
        <td>Office Manager</td>
        <td>London</td>
        <td>37</td>
        <td>2008/12/11</td>
        <td>$136,200</td>
      </tr>
      <tr>
        <td>Jackson Bradshaw</td>
        <td>Director</td>
        <td>New York</td>
        <td>65</td>
        <td>2008/09/26</td>
        <td>$645,750</td>
      </tr>
      <tr>
        <td>Olivia Liang</td>
        <td>Support Engineer</td>
        <td>Singapore</td>
        <td>64</td>
        <td>2011/02/03</td>
        <td>$234,500</td>
      </tr>
      <tr>
        <td>Bruno Nash</td>
        <td>Software Engineer</td>
        <td>London</td>
        <td>38</td>
        <td>2011/05/03</td>
        <td>$163,500</td>
      </tr>
      <tr>
        <td>Sakura Yamamoto</td>
        <td>Support Engineer</td>
        <td>Tokyo</td>
        <td>37</td>
        <td>2009/08/19</td>
        <td>$139,575</td>
      </tr>
      <tr>
        <td>Thor Walton</td>
        <td>Developer</td>
        <td>New York</td>
        <td>61</td>
        <td>2013/08/11</td>
        <td>$98,540</td>
      </tr>
      <tr>
        <td>Finn Camacho</td>
        <td>Support Engineer</td>
        <td>San Francisco</td>
        <td>47</td>
        <td>2009/07/07</td>
        <td>$87,500</td>
      </tr>
      <tr>
        <td>Serge Baldwin</td>
        <td>Data Coordinator</td>
        <td>Singapore</td>
        <td>64</td>
        <td>2012/04/09</td>
        <td>$138,575</td>
      </tr>
      <tr>
        <td>Zenaida Frank</td>
        <td>Software Engineer</td>
        <td>New York</td>
        <td>63</td>
        <td>2010/01/04</td>
        <td>$125,250</td>
      </tr>
      <tr>
        <td>Zorita Serrano</td>
        <td>Software Engineer</td>
        <td>San Francisco</td>
        <td>56</td>
        <td>2012/06/01</td>
        <td>$115,000</td>
      </tr>
      <tr>
        <td>Jennifer Acosta</td>
        <td>Junior Javascript Developer</td>
        <td>Edinburgh</td>
        <td>43</td>
        <td>2013/02/01</td>
        <td>$75,650</td>
      </tr>
      <tr>
        <td>Cara Stevens</td>
        <td>Sales Assistant</td>
        <td>New York</td>
        <td>46</td>
        <td>2011/12/06</td>
        <td>$145,600</td>
      </tr>
      <tr>
        <td>Hermione Butler</td>
        <td>Regional Director</td>
        <td>London</td>
        <td>47</td>
        <td>2011/03/21</td>
        <td>$356,250</td>
      </tr>
      <tr>
        <td>Lael Greer</td>
        <td>Systems Administrator</td>
        <td>London</td>
        <td>21</td>
        <td>2009/02/27</td>
        <td>$103,500</td>
      </tr>
      <tr>
        <td>Jonas Alexander</td>
        <td>Developer</td>
        <td>San Francisco</td>
        <td>30</td>
        <td>2010/07/14</td>
        <td>$86,500</td>
      </tr>
      <tr>
        <td>Shad Decker</td>
        <td>Regional Director</td>
        <td>Edinburgh</td>
        <td>51</td>
        <td>2008/11/13</td>
        <td>$183,000</td>
      </tr>
      <tr>
        <td>Michael Bruce</td>
        <td>Javascript Developer</td>
        <td>Singapore</td>
        <td>29</td>
        <td>2011/06/27</td>
        <td>$183,000</td>
      </tr>
      <tr>
        <td>Donna Snider</td>
        <td>Customer Support</td>
        <td>New York</td>
        <td>27</td>
        <td>2011/01/25</td>
        <td>$112,000</td>
      </tr>
    </tbody>
    <tfoot>
      <tr>
        <th>Name</th>
        <th>Position</th>
        <th>Office</th>
        <th>Age</th>
        <th>Start date</th>
        <th>Salary</th>
      </tr>
    </tfoot>
  </table>
</div>

如你所见，我创建了一个类构造函数，这是我能做的最好的。我的问题是：如何将 function updateInputs 放在 class IonRangeWrapper 内？为了澄清，我想在下面做这样的事情：

class IonRangeWrapper {
  constructor() {
    // init ion.rangeSlider
    // create instance
    // connect it to inputs
  }
  
  update() {} // public method: function updateInputs()
}

// create as many instances of that class as needed:
const slider1 = new IonRangeWrapper(config);
const slider2 = new IonRangeWrapper(config);

CodePen

解决方法

const _ = require('../shared/lodash');
const urlService = require('../src/urlService');
const http = require('../src/http');
const MAX_FAILURES = 3;

let failCount = 0;

const disableLogger = () => {
  //Do something
}

const myFunction = (event) => {
  if(!global.state.enabled){
    return;
  }

  const url = urlService.getURL('client',global.state.service);

  event.timeStamp = new Data().toISOString();
  event.app = global.state.appName;
  event.version = global.state.web.version;
  event.level = event.level || global.state.logger.level;

  if(window.location.origin.includes('com')){
    event.role = global.state.profile.role;
  }

  if(event.level > 5){
    event.type = 'ERROR';
  }

  if(_.has(event,'data.status')){
    event.status = event.data.status;
  }

  let serviceID = 'client-logger';
  http.serviceRequest(serviceID,url,event,'POST',res => {
    if(res.error){
      if(failCount >= MAX_FAILURES){
        global.state.logger.error = true;
        disableLogger();
        failCount = 0;
      }else{
        failCount ++;
        if(failCount == 2){
          myFunction({action: "CLIENT FAIL"});
        }
      }
    }
  })
}

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