javascript - 为什么 .matchMedia 在这些特定条件下不起作用？

Question

我正在制作一个页面，当屏幕宽度大于 500 像素时使用按钮显示内容，然后当屏幕小于 500 像素时，它会移动到“手风琴”样式布局。我正在使用事件侦听器并匹配媒体以及 if/else 语句来确定要运行的代码。

但是，当代码以小于 500 像素的窗口运行，然后将其拖出以使其大于 500 像素时，按钮在按下时不会响应“onclick”并且没有任何反应。

有人可以告诉我这里哪里出错了吗？

请在此处查看 JSfiddle

//Start listing variables for use in array.
var art1 = document.getElementById("article1");
var button1 = document.getElementById("list1");

var art2 = document.getElementById("article2");
var button2 = document.getElementById("list2");

var art3 = document.getElementById("article3");
var button3 = document.getElementById("list3");

var articleArray = [art1, art2, art3];
var buttonArray = [button1, button2, button3];



function mediaQuery(x) {
//If window is under 500px in width.
  if (x.matches) {
//Begin accordion code
   var initAccordion = function(accordionElement) {

    function handlePanelClick(event) {
    showPanel(event.currentTarget);
  }

  function showPanel(panel) {
  var expandedPanel = accordionElement.querySelector(".active");
  if (expandedPanel) {
        expandedPanel.classList.remove("active");
  }
  panel.classList.add("active");
  }

  var allPanelElements = accordionElement.querySelectorAll(".panel");
  for (var y = 0; len = allPanelElements.length; y++ ) {
        allPanelElements[y].addEventListener("click", handlePanelClick);
  }

 showPanel(allPanelElements[0]);

}
initAccordion(document.getElementById("contentWrapper"));

  } 
  else //If window if is over 500px in width.
  {
    //Begin button code.
    var createfunc = function (i) {
    return function() { document.getElementById("fillMe").innerHTML = articleArray[i].innerHTML;};
}


for (let i=0; i < articleArray.length; i++) {
let button = buttonArray[i];
button.addEventListener("click", createfunc(i));
}
  }
}


//Declare media query and add listener.
var x = window.matchMedia("(max-width: 500px)")
mediaQuery(x) // Call listener function at run time
x.addListener(mediaQuery) // Attach listener function on state changes

标签： javascriptif-statementaddeventlistenermatchmedia