为什么Flex Slider无法与Min-Max动态范围一起使用

我想在移动设备中显示3个缩略图，在flex滑块中显示4个缩略图。为此，我使用的是带有动态最小/最大范围版本的flex slider的轮播。如果调整该页面的大小，则会看到根据浏览器窗口宽度更改的Thmubanils数量。但是，当我在我的网站或JSFIDDLE中使用相同的代码或无效的任何地方时使用相同的代码。这是JSFIDDLE的证明和相同的代码：

(function() {
  // store the slider in a local variable
  var $window = $(window),
    flexslider = {
      vars: {}
    };
  // tiny helper function to add breakpoints
  function getGridSize() {
    return (window.innerWidth < 600) ? 2 :
      (window.innerWidth < 900) ? 3 : 4;
  }
  $window.load(function() {
    $('.flexslider').flexslider({
      animation: "slide",
      animationLoop: false,
      itemWidth: 210,
      itemMargin: 5,
      minItems: getGridSize(), // use function to pull in initial value
      maxItems: getGridSize() // use function to pull in initial value
    });
  });
  // check grid size on resize event
  $window.resize(function() {
    var gridSize = getGridSize();
    flexslider.vars.minItems = gridSize;
    flexslider.vars.maxItems = gridSize;
  });
}());

.container {
  width: 70%;
  max-width: 1100px;
  margin: auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flexslider/2.6.3/jquery.flexslider.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/flexslider/2.6.3/flexslider.min.css" rel="stylesheet" />
<div class="container">
  <div class="flexslider">
    <ul class="slides">
      <li>
        <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_cheesecake_brownie.jpg" />
      </li>
      <li>
        <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_lemon.jpg" />
      </li>
      <li>
        <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_donut.jpg" />
      </li>
      <li>
        <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_caramel.jpg" />
      </li>
      <!-- items mirrored twice, total of 12 -->
    </ul>
  </div>

我正在考虑将其报告为GitHub上的问题，但我对为什么在实际Flex Slider网站上工作的原因很谨慎。

奇怪的是，这个滑块的官方文档缺少这些关键信息。您必须在启动或加载时将滑块的实例设置为flexslider全局变量。

工作示例。

 (function() {
        // store the slider in a local variable
        var $window = $(window),
            flexslider = {
                vars: {}
            };
        // tiny helper function to add breakpoints
        function getGridSize() {
            return (window.innerWidth < 600) ? 2 :
                (window.innerWidth < 900) ? 3 : 4;
        }
       
        $window.ready(function() {
            $('.flexslider').flexslider({
                animation: "slide",
                animationLoop: false,
                itemWidth: 210,
                itemMargin: 5,
                minItems: getGridSize(), // use function to pull in initial value
                maxItems: getGridSize(),
          			start: function(slider){
                //set slider instance to flexslider variable
            			flexslider = slider;
          	}
            });
        });
        // check grid size on resize event
        $window.resize(function() {
            var gridSize = getGridSize();
            flexslider.vars.minItems = gridSize;
            flexslider.vars.maxItems = gridSize;
        });
        
    }());

.container {
  width: 70%;
  max-width: 1100px;
  margin: auto;
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div class="container">
<div id="carousel" class="flexslider">
  <ul class="slides">
    <li>
      <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_cheesecake_brownie.jpg" />
    </li>
    <li>
      <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_lemon.jpg" />
    </li>
    <li>
      <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_donut.jpg" />
    </li>
    <li>
      <img src="http://flexslider.woothemes.com/images/kitchen_adventurer_caramel.jpg" />
    </li>
    <!-- items mirrored twice, total of 12 -->
  </ul>
</div>
	</div>
	
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flexslider/2.6.3/jquery.flexslider.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/flexslider/2.6.3/flexslider.min.css" rel="stylesheet" />
</body>
</html>

这是Min-Max动态范围的工作示例。

    var $window = jQuery(window),
    flexslider = {
        vars: {}
    };
    
    function getGridSize() {
            return (window.innerWidth <= 767) ? 2 : (window.innerWidth <= 900) ? 2 : (window.innerWidth <= 1024) ? 3 : (window.innerWidth > 1025) ? 5 : 5;
}
$window.ready(function() {
        jQuery('.flexslider').flexslider({
            animation: "slide",
            slideshow: false,
            itemWidth: 248,
            itemMargin: 5,      
            minItems: 2,
            maxItems: getGridSize(),
            controlNav: false
        });

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