下拉Javascript错误:对象不支持属性或方法'匹配'

Question

我正在使用以下JavaScript下拉列表,除了新的Windows Edge之外,它适用于所有浏览器.

它显示以下错误:

SCRIPT438:对象不支持属性或方法'匹配'

脚本:

/* When the user clicks on the button, 
toggle between hiding and showing the dropdown content */
function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown menu if the user clicks outside of it
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {

    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

得到了以下脚本:http://www.w3schools.com/howto/howto_js_dropdown.asp,我认为它与所有平台兼容.现在我已经实现了它,并在Edge中遇到了问题.

Answer 1

看起来您尝试检查click事件是否由具有类dropbtn的对象触发.

如果您使用jQuery,您可以这样做:

function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown menu if the user clicks outside of it
window.onclick = function(event) {
  if (!$(event.target).hasClass('dropbtn')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

如果你不使用jQuery,你可以得到className,然后检查dropbtn是否是其中之一.

function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown menu if the user clicks outside of it
window.onclick = function(event) {
  var classes = event.target.className.split(' ');
  var found = false; var i = 0;
  while (i < classes.length && !found) {
      if (classes[i]=='dropbtn') found = true;
      else ++i;
  }
  if (!found) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

Answer 2

正如之前提到的，IE11 部分支持它。尝试这个

if (!Element.prototype.matches) {

    Element.prototype.matches = Element.prototype.msMatchesSelector;

}