jquery delete function has cache

jQuery is a JavaScript library that provides an elegant and concise way to process HTML documents, handle events, create animation effects, and access XML documents, allowing developers to complete Web development tasks more easily.

In the process of web development, it is often necessary to delete data. In the process of using jQuery, the delete function provided by it is often used. However, in the actual implementation process, we may encounter a problem: jQuery delete function has cache.

So, what is the jQuery delete function with cache? jquery's cache essentially caches the DOM node that has been loaded. The next time the DOM node needs to be used again, it is obtained directly from the cache, avoiding the process of recalculating the DOM tree, thereby improving performance. The jQuery delete function has a cache, which means that when we call the delete function, due to the existence of the cache, the node may still exist in the cache, resulting in a problem that the page display is out of sync with the actual delete operation.

In the specific implementation process, if we operate on a deleted node, we will find that the content inside the node still exists and can be operated. At the same time, if we reload the same content, we will also find that the deleted nodes still exist instead of being completely deleted.

In order to avoid such problems, we need to clear the cache manually. jQuery provides a $.cleanData() method to clear the cache of DOM elements, which can be used to ensure successful deletion after deleting the element.

For specific implementation, please refer to the following sample code:

// 获取要删除的元素
var $element = $('#example');

// 删除元素
$element.remove();

// 清除缓存
$.cleanData($element.get());

// 此时重新加载该元素将会失败，证明元素已经被彻底删除
$('#example').html('test');

In this way, we can ensure that the cache is completely cleared after the element is deleted, avoiding problems caused by cache.

In actual development, it should be noted that if we use it again after deleting an element, we will find that the element has not been deleted, but still exists in the cache. Therefore, after removing an element, be careful to avoid using it again.

In summary, although the jQuery delete function has a cache, we can avoid this problem and improve the accuracy and efficiency of the code by manually clearing the cache. In actual projects, we should fully understand and master the relevant knowledge of jQuery, and adjust the code in a targeted manner to avoid similar problems.

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