Examples of three methods of JavaScript calling the background_javascript skills

Method 1: Directly use <%=%> to call

Front-end JS:

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Back method:

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public static string BehindMethod()
                                              >             return "This is a background method";

Method 2: Use ajax to call

Front-end js:

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The code is as follows:



Page html:





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The code is as follows:

< /label>
                                                                                                                                                                                                                                                                                             ​" />

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The code is as follows:[System.Web.Services.WebMethod] Public Static String Getimg (String Ext) { System.threading.thread.sleep (5000); // For the sake of waiting for 5 seconds

StringComparer SC = Ignorecase;

string[] extArr = new string[] { "php", "asp", "aspx", "txt", "bmp" }; , EXT); // Determine whether there is a

if (f)
{
Return "Image/54222860.jpg"; image/star1.jpg";
      }




Method 3: AjaxPro (also ajax)


Step one: Download AjaxPro.dll (or AjaxPro.2.dll) and add a reference to the project

Step 2: Modify the configuration file web.config

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The code is as follows:

   

Step 3: Register AjaxPro at runtime in the Page_Load event. Such as:





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The code is as follows:

protected void Page_Load(object sender, EventArgs e) { ajaxpro.utility.registerTypeForajax (Typeof (ajaxDemo)); // Register }

Step 4: Create the server method and mark it with [AjaxPro.AjaxMethod]

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The code is as follows:

[AjaxPro.AjaxMethod] public string GetImgByAjaxPro( :) Step 5: Calling front-end JS:

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The code is as follows:


function GetMethodByAjaxPro() {

var a = JustTest .AjaxDemo.GetImgByAjaxPro();//JustTest is the current namespace, AjaxDemo represents the background class             document.getElementById("imgAjaxPro").src = a.value; >