Question

在我的 div 中，我想观察他的类，所以当这个类$('#add_favourite').on('click', function (event) { event.preventDefault(); $('#log').text('add'); update_favourite('add'); }); function update_favourite(addOrRemove) { if ($('#add_favourite').length) { $('#add_favourite').off('click'); console.log('add favourite is being removed'); $('#submitbutton').val('Remove from Favourites'); $('#add_favourite').attr("id", "remove_favourite"); $('#remove_favourite').on('click', function (event) { event.preventDefault(); $('#log').text('remove'); console.log('remove'); update_favourite('remove'); }); } else if ($('#remove_favourite').length) { console.log('remove favourite is being removed'); $('#remove_favourite').off('click'); $('#submitbutton').val('Add to Favourites'); $('#remove_favourite').attr("id", "add_favourite"); $('#add_favourite').on('click', function (event) { event.preventDefault(); console.log('add'); update_favourite('add'); }); } }添加到我的div中时，我会执行一些js函数。

初始div：passed

添加新课程后：<div id="1" class="allow"></div>

我的执行功能：

<div id="1" class="allow passed"></div>

Answer 1

您还可以在该div上使用变异观察器来检测何时添加类。请注意变异观察者的使用.. https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver

    var observer = new MutationObserver(function(mutations) {
       mutations.forEach(function(mutation) {
         if (mutation.attributeName === "class") {
            if ($(mutation.target).hasClass('passed')){
                    alert("passed class was added");
                    fill();
           }
         }
     });
  });

observer.observe(document.getElementById('1'), {
  attributes: true
});

这是一个jsfiddle https://jsfiddle.net/e37am2hq/

如何观察为div添加类

1 个答案: