The example in this article explains the detailed code of jQuery to achieve a simple like effect. The specific content is as follows
Rendering:
The following provides an example code for "like", implemented with ASP.NET MVC4+jQuery Ajax.
Model:
namespace MvcAjaxAdd.Models { public class ClickCountModel { [Key] [DatabaseGeneratedAttribute(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)] public int ID { get; set; } public string URL { get; set; } public int? Num { get; set; } } }
View:
@{ ViewBag.Title = "Index"; } @model MvcAjaxAdd.Models.ClickCountModel <script src="~/Scripts/jquery-1.7.1.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { var obj = { "num": $("#lblnum").text(), "url": window.location.pathname//获取/Home/Index }; $("#addnum").click(function () { $.ajax({ type: 'POST', url: '/Home/ClickGood', data: obj, success: function (data) { $("#lblnum").text(data.Num); //其它操作,比如每个登录用户只能点一次,按钮禁用等 } }); }); }); </script> <div id="addnum" style="width: 70px; height: 70px; background-color: #FF9900"> <div align="center" style="margin-top: 10px;"> <label style="color: White; font-size: 20pt;"> 顶</label></div> <div align="center"> <label id="lblnum" style="color: White; font-size: 10pt;"> @Model.Num</label></div> </div>
Controller:
namespace MvcAjaxAdd.Controllers { public class HomeController : Controller { private ClickCountContext db = new ClickCountContext(); public ActionResult Index() { ClickCountModel ClickCountModel = db.ClickCountModels.FirstOrDefault(x => x.URL == "/"); return View(ClickCountModel); } [HttpPost] public JsonResult ClickGood(ClickCountModel ClickCountModel) { ClickCountModel newClickCountModel = db.ClickCountModels.FirstOrDefault(x => x.URL == ClickCountModel.URL); newClickCountModel.Num++;//数量+1 db.SaveChanges(); return Json(newClickCountModel); } } }
The above is the entire content of this article. I hope it will be helpful to everyone in learning jquery programming.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

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.


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