Three Ajax implementation methods and AJAX parsing JSON

This time I will bring you three Ajax implementation methods and AJAX parsing JSON. What are theprecautionsfor Ajax three implementation methods and AJAX parsing JSON? Here are practical cases, let’s take a look.

Preparation:

1、 prototype.js
2、 jquery1.3.2.min.js
3、 json2.js

Background processing program (Servlet), access path servlet/testAjax:

Java code

package ajax.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Ajax例子后台处理程序 * @author bing * @version 2011-07-07 * */ public class TestAjaxServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); String name = request.getParameter("name"); String age = request.getParameter("age"); System.out.println("{\"name\":\"" + name + "\",\"age\":\"" + age + "\"}"); out.print("{\"name\":\"" + name + "\",\"age\":" + age + "}"); out.flush(); out.close(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } }

TestAjaxServlet receives two parameters: name and age, and returns a JSONString written in format.

Front page parameter input interface:

Html code

显示区域
 
 name:
 age:
 

1. Prototype implementation

Html code

In the Ajax implementation of prototype, use the evalJSON method to convert the string into a JSON object.

2. jquery implementation

Html code

I’m new to jQuery, and I’m in json The processing is done with the help of json2.js. I also ask my seniors for advice. .

3. XMLHttpRequest implementation

##Html code

ps :Three ways to convert strings into JSON

ECMA-262(E3) did not write the JSON concept into the standard, but in ECMA-262(E5) the concept of JSON was officially introduced, including the global JSON object and the Date toJSON method.

1, eval method analysis, I am afraid this is the earliest analysis method.

function strToJson(str){ var json = eval('(' + str + ')'); return json; }

2, the new Function form is quite weird.

function strToJson(str){ var json = (new Function("return " + str))(); return json; }

3, use the global JSON object.

function strToJson(str){ return JSON.parse(str); }

var str = '{name:"jack"}'; var obj = JSON.parse(str); // --> parse error

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