$('.selector').sortable(options);
Simple example:
> ;
Drag the mouse to adjust the order of the following options
Rendering:

2: Associated sorted list
Usually sorting two or more lists at the same time is called an associated sorted list, and use the attribute connectWidth to set one selector, so that you can specify the order in which elements are moved between different lists
3: Method of sorting components

This method can serialize the id attribute of the sortable element into a The form or Ajax string that can be submitted has the following syntax:
$("#sortable").sortable(serialize", [options]);
3.2 toArray method: This method serializes the id of the sortable element into a string array. The syntax format is as follows:
$("#sortable").sortable("toArray");
3.3 refresh method: The method is used to refresh the sortable list
$("#sortable").sortable("refresh");
3.4 refreshPositons method :This method is used to refresh the cache position of sortable elements. The syntax format is as follows:
$("#sortable").sortable("refreshPositions");
3.5 cancel: The method is used to cancel the order change of elements in the current sortable object
$("#sortable").sortable("cancel");
Copy code
调整下列课程的安排顺序
Rendering:

Here att is used as the key, and the value is the string defined with att in the layout.
4: Sorting time callback function
You can control the sorting operation more flexibly by defining a callback function
4.1 start: Event type is sortstart, triggers when sorting starts
4.2 sort: event type is sort, triggers during sorting process
4.3 change: event type is sortchange, during sorting process , triggered when the position of the element changes
4.4 beforestop: The event type is sortbeforestop, triggered when sorting is stopped but placeholders or auxiliary elements are still available
4.5 stop: The event type is sortstop, which is triggered when the sorting process stops.
4.6 update: The event type is sortupdate, which is triggered when the sorting process is stopped and the element position has changed.
4.7 receive: event type is sortreceive, triggered when the connected sorted list has received an element from another list
4.8 remove: event type is sortremove, triggered when an element is removed from the list Triggered when sorting elements and placing them into another list
4.9 over: The event type is sortover, triggered when a sortable element is moved to another connected list
4.10 out: The event type is sortout, which is triggered when a sortable element is removed from the connected list.
4.11 activate: The event type is sortactivate, which is triggered when a connected sorted list is used. Each The connection list receives this event when dragging starts
4.12 deactivate: The event type is sortdeactivate, which is triggered when the sorting operation is stopped. This event will be propagated to all possible connection lists
$("#droppable").droppable({
eventName: function (event, ui) {
}
});
ui is a jQuery object containing additional information. The jQuery object has the following properties
helper: A jQuery object, representing the current element to be sorted
position: An object containing the top attribute and left attribute, indicating the position of the current element relative to the original object
offset: An object containing top and left attributes, indicating the absolute position of the current element relative to the page
item: Representing the currently dragged jQuery object
placeholder: Represents the defined placeholder
sender: The sorted list to which the currently dragged element belongs, only applicable to moving between two lists
改变下面列车的顺序,查看事件触发结果


JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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