Three methods for obtaining, setting, and removing element attributes in javascript

The following html is used as an example. 1 & lt; divid & quot; myDiv & quot; class & quot; bd & quot; title & quot; I am div & quot; & gt; 2 & lt; imgid & quot; img1 & quot;/& gt; 3 & lt; aid & quot; myA & quot; href & quot; http://www.bai

The following html is used as an example.

1
2
3 Baidu
4 1. Obtain and set the element features through the attributes of the HTMLElement type (object)

1 var div = document. getElementById ("myDiv ");
2 var img = document. getElementById ("img1 ");
3 var a = document. getElementById ("myA ");
4 // obtain element features
5 alert (div. id); // "myDiv"
6 alert (div. className); // "bd", this is not div. class, because class is reserved keyword
7 alert (div. title); // "I am div"
8 alert (a. href); // http://www.baidu.com
9 // set element features
10 div. id = "myDiv2"; // change the id to "myDiv2"
11 div. className = "ft"; // change the class to "ft". If there is a style named "ft", it will immediately become "ft" and the browser will immediately respond.
12 div. title = "myDiv2"; // change the title to "myDiv2"
13 div. align = "center"; // set center alignment
14 img. src = "images/img1.gif"; // set the image path
15 a. innerHTML = "Sina"; // change "Baidu" to "Sina"
16 a. href = "http://www.sina.com.cn"; // reset the hyperlink
2. the getAttribute (), setAttribute (), and removeAttribute () methods are used to obtain, set, and remove the features of an element (not recommended. IE6 and 7 of the first two methods have an exception, the third method is not supported by IE6 and can be used to set custom features)
The getAttribute () method is used to obtain element features. Take a parameter to obtain the feature name of the element.
SetAttribute () method, used to set element features. Two parameters are used to obtain the feature name and feature value of an element.
The removeAttribute () method is used to remove the features of an element. Accept a parameter, that is, the feature name of the element to be removed.

1 var div = document. getElementById ("myDiv ");
2 var img = document. getElementById ("img1 ");
3 var a = document. getElementById ("myA ");
4 // obtain element features
5 alert (div. getAttribute ("id"); // "myDiv"
6 alert (div. getAttribute ("class"); // "bd", note that this is a class, not a className, which is different from the above
7 alert (div. getAttribute ("title"); // "I am div"
8 alert (a. getAttribute ("href"); // http://www.baidu.com
9 // set element features
10 div. setAttribute ("id", "myDiv2"); // change the id to "myDiv2"
11 div. setAttribute ("class", "ft"); // change the class to "ft", which is also a class instead of className.
12 div. setAttribute ("title", "myDiv2"); // change the title to "myDiv2"
13 div. setAttribute ("align", "center"); // set center alignment
14 img. setAttribute ("src", "images/img1.gif"); // you can specify the image path.
15 // remove element features
16 div. removeAttribute ("class"); // remove the class Feature
3. Get, set, and remove element features through attributes

1 var div = document. getElementById ("myDiv ");
2 // obtain element features
3 alert (div. attributes ["id"]. nodeValue); // "myDiv"
4 // set element features
5 div. attributes ["id"]. nodeValue = "myDiv2"; // change the id to "myDiv2"
6 // remove element features
7 div. attributes. removeNamedItem ("class"); // remove the class Feature

Author: cangkukuaimanle