Talk about the example usage of ajax asynchronous request

1. Introduction JavaScript is single-threaded and can only execute one task at a time. When a task takes a long time, subsequent tasks must wait. So, is there any way to solve this kind of problem? (Leave aside WebWorker), that is to let the code execute asynchronously. What does it mean? For example, during an Ajax asynchronous request, the value of readyState is continuously monitored to determine the execution of the specified callback function. There are usually three types of asynchronous execution, callback functions, event listening, and publish and subscribe. Event listening and publish and subscribe are actually similar, but the latter is more robust. Such as callback function, callback function is the simplest programming idea applied in asynchronous execution. As follows: function async(item,callback){ console.log(item); setTimeout(function(){ &n

1. Detailed introduction to Promise in JavaScript

# #Introduction: 1. Introduction JavaScript is single-threaded and can only perform one task at a time. When a task takes a long time, subsequent tasks must wait. So, is there any way to solve this kind of problem? (Leave aside WebWorker), that is to let the code execute asynchronously. What does it mean? For example, during an Ajax asynchronous request, the value of readyState is continuously monitored to determine the execution of the specified callback function. There are usually three types of asynchronous execution, callback functions, event listening, and publish and subscribe. Event listening and publish and subscribe are actually similar, but the latter is more robust. Such as callback function, return...

2. javascript - ajax asynchronous request for data, ios screen flashes

Introduction: When making a chat page, ajax asynchronously requests data, regardless of whether there is data returned, ios will flash, but android will not flash, what is going on, how to solve {code...}

3. ajax and html5 change the page URL without refreshing

Introduction: Performance If you use a browser such as chrome or firefox to visit this blog, github.com, plus.google.com and other websites, if you are careful, you will find that clicks between pages are requested asynchronously through ajax. At the same time, the page The URL happened..

4. ajax asynchronous request php background processing time-consuming task session_write_close

Introduction ::This article mainly introduces the time-consuming task session_write_close of ajax asynchronous request to PHP background processing. Students who are interested in PHP tutorials can refer to it.

5. Ajax asynchronous request for PHP data, ajax asynchronous php_PHP tutorial

Introduction: Ajax asynchronous request for PHP data, ajax async php. Ajax asynchronous request for PHP data, ajax asynchronous php Source: http://www.ido321.com/1138.html I received an assignment from the teacher, and the implemented layout is as shown in the figure: If the department ID is entered, the department name is only

6. Ajax Asynchronous Request for PHP Data_PHP Tutorial

Introduction: Ajax asynchronously requests PHP data. Ajax asynchronous request for PHP data received an assignment from the teacher. The layout of the implementation is as shown in the figure: If the department ID is entered, only the department name corresponding to the ID will be displayed. If not, all will be displayed,

7. Ajax asynchronous request function error, many browsers cannot succeed, prompt is not a function

Introduction: Ajax asynchronous request function error, many browsers The server failed, prompting is not a function

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Ajax asynchronous request for PHP data

Introduction: I received an assignment from the teacher. The layout is as shown in the figure: If the department ID is entered, only the name of the department corresponding to the ID will be displayed. If not, all will be displayed, and then according to the name of department I value, the text box in the major department will automatically display the major department where the department name is located. For example: Select the painstaking

9. Ajax asynchronous request for PHP data, ajax asynchronous php

Introduction: Ajax asynchronous Request PHP data, ajax asynchronous php. Ajax asynchronous request for PHP data, ajax asynchronous php Source: http://www.ido321.com/1138.html I received an assignment from the teacher, and the implemented layout is as shown in the figure: If the department ID is entered, the department name is only

10. Comparison of time spent on Ajax asynchronous requests

Introduction: ec(2); Comparison of the time it takes for Ajax to asynchronously obtain the target content. Method 1. MVC mode accesses the specified function of the directory object and executes the query statement Method 2. Directly create the sql statement and database connection, and execute the query statement. Method 3. Zend_Db of ZendFramework executes query statements Html code:

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