the method getattribute(string
时间: 2023-05-02 19:04:40 浏览: 51
方法 getattribute(string 是Python中的一个魔术方法(magic method),用于在对象中获取属性。当对象的某个属性被访问时,该方法会被自动调用,可以重写该方法以自定义属性的获取行为。
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getAttribute
The getAttribute method is a built-in JavaScript function that is used to retrieve the value of a specified attribute of an HTML element. It takes one parameter, which is the name of the attribute whose value is to be retrieved. The method returns the value of the specified attribute as a string.
For example, to retrieve the value of the "src" attribute of an image element with an ID of "myImage", we can use the following code:
```
let imgSrc = document.getElementById("myImage").getAttribute("src");
```
request.session.getAttribute
request.session.getAttribute() is a method in Java Servlet programming that allows a developer to retrieve an attribute value stored in the HttpSession object associated with the current user session. The method takes a String parameter representing the name of the attribute whose value needs to be retrieved. The method returns an Object that represents the value of the attribute or null if the attribute does not exist in the session.
For example, if a session attribute named "username" is stored in the HttpSession object, the attribute value can be retrieved using the following code:
String username = (String) request.getSession().getAttribute("username");
This code retrieves the value of the "username" attribute and casts it to a String type. If the attribute does not exist in the session, the variable "username" will be null.