Convert jquery object to dom object

jQuery is a very popular JavaScript library that provides developers with some very practical DOM manipulation methods and functions. In the process of using jQuery, we often encounter the need to convert jQuery objects into DOM objects. So, how do you convert a jQuery object into a DOM object? Next, we will explain this issue in detail.

The difference between a jQuery object and a DOM object is that a jQuery object is a collection that encapsulates one or more DOM elements, while a DOM object is a single element. In other words, when we use jQuery selector to select one or more DOM elements, the returned result is a jQuery object.

Then, the method of converting a jQuery object into a DOM object is also very simple. You only need to use the get method or index method of the jQuery object.

First, let’s take a look at the get method. The function of this method is to obtain the DOM element at the specified position in the jQuery object and return the DOM element, for example:

var $div = $('div'); // 获取所有div元素，返回一个jQuery对象
var div1 = $div.get(0); // 获取第一个div元素，并将其转换为DOM对象
console.log(div1.tagName); // 获取该DOM元素的标签名，输出：DIV

In the above code, we Get all div elements through jQuery's selector and encapsulate them into a jQuery object. Then, use the get method to get the first div element and convert it into a DOM object. Finally, use the tagName attribute of the DOM object to obtain the tag name of the element and output the result.

Next, let’s take a look at the index method. The function of this method is to obtain the position of the specified DOM element in the jQuery object, for example:

var $p = $('p'); // 获取所有p元素，返回一个jQuery对象
var p1 = document.getElementsByTagName('p')[0]; // 获取第一个p元素，返回DOM对象
var index = $p.index(p1); // 获取第一个p元素在$p对象中的位置
console.log(index); // 输出：0

In the above code, we use jQuery’s selection The processor gets all p elements and encapsulates them into a jQuery object. Then, use native JavaScript to get the first p element and convert it to a DOM object. Finally, use the index method to obtain the position of the first p element in the $p object and output the result.

In addition to using the get method and index method, we can also use a for loop to traverse the DOM elements in the jQuery object, for example:

var $tr = $('tr'); // 获取所有tr元素，返回一个jQuery对象
for (var i = 0; i < $tr.length; i++) {
  var tr = $tr[i]; // 获取第i个tr元素，并将其转换为DOM对象
  console.log(tr.tagName); // 输出该DOM元素的标签名
}

In the above code, we use jQuery selection The constructor gets all tr ​​elements and encapsulates them into a jQuery object. Then, use a for loop to iterate through all DOM elements in that object and convert them into DOM objects. Finally, output the tag name of each DOM element.

To sum up, the method of converting jQuery objects into DOM objects is very simple. You only need to use the get method, index method or for loop. It should be noted that when performing DOM manipulation, it is recommended to use native JavaScript instead of jQuery. Because native JavaScript is more efficient than jQuery and does not rely on external libraries.

The above is the detailed content of Convert jquery object to dom object. For more information, please follow other related articles on the PHP Chinese website!