What does console.log mean in a js if conditional statement?

recently I saw a piece of js code in the source code of WeChat Mini Programs, but I couldn"t figure out what it meant. The code is as follows:

if (console.log(a), void 0 !== a.bet) 
    return wx.showToast({
            title: "title",
            icon: "none"
        });

the two parameters separated by commas in if () parentheses, console.log (a) and void 0! = = a.bet, understand that if you put them together, you don"t know why you write this and what it means. Please give me an answer, thank you very much!

Javascript

Mar.18,2021

this is the comma expression . The comma expression is executed from left to right and returns the value of the last expression

  Link description


										
												Previous: The cut picture is not clear and has rough edges.
												                		Next: How should multi-column selection of Table components in elementUI be implemented?
                							
					
						
					
															
						
														
								The proportional width of the echarts graph is inconsistent.
								
The horizontal coordinates of  echarts are not specifically marked, and the X coordinates do not have a grid to indicate. Here is a figure that specifies   .
 js 
 *  * 
createChartSix() {
  this.$http
    .get(this.$api.dataChart)
    .then(rsp => {
...
								
									
																														Javascript
																			
									
										Feb.26,2021
									
								
							
														
								Using node to build video streaming server
								
  sincerely ask for advice:  
< hr >
 I want to use node as the background to build a video streaming server. The front end is similar to Youku VOD. It can  record the playback node  function, and  load the progress bar at any point  (starting from the c...
								
									
																														Cache
																				nginx
																				linux
																				node.js
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								In the chained promise function, how to determine which promise threw the error
								
 I need to implement in a chained promise function, any function error in the middle terminates the program, and can catch the error function, and then perform different operations according to different error functions. How can the following code be imp...
								
									
																														Javascript
																				es6
																			
									
										Feb.26,2021
									
								
							
														
								Ajax request
								
  
 I would like to ask what is wrong with this code. Thank you for your answers. 
...
								
									
																														Javascript
																			
									
										Feb.26,2021
									
								
							
														
								Apply method confusion
								 is doing a question on Niuke.com. I encounter a problem:  to achieve the function callIt, after the call meets the following conditions  1, the returned result is the result after calling fn  2, and the call parameter of fn is all the parameters after th...
								
									
																														Javascript
																			
									
										Feb.26,2021
									
								
							
														
								Countdown, click event?
								 A timing examination system is triggered if the click event is triggered within 5 seconds, and if it is not triggered, the system marks the correct answer at the end of the countdown. How to implement ...
								
									
																														Html
																				css
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								On the problem of regular matching
								
 description: a regular match is given to the content of an input box, and the matching content is the product activation code.  looks like this:  "0C31-0B81-BB32-3094-0C31-0B81-BB32-3094 " 
 Code: 
$(  -sharplicenseCode  ).keyup(function () {
        le...
								
									
																														Python
																				html5
																				html
																				php
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								Custom event, 2 clicks at a time
								
 1. The custom event triggers the click event of .cpcstartrefresh, but triggers 2 click events each time 
 2. The code is as follows:  window.onmessage = function (e) {     create an event object, 
    var myEvent = document.createEvent(  Event  );
    m...
								
									
																														Javascript
																			
									
										Feb.26,2021
									
								
							
														
								Problems with Chrome downloading using window.open ()
								
 I configured the MIME type of the file with the amr suffix in the apache configuration as application ms-download, Why it is a garbled page when opening a file in amr format using window.open in chrome, while a file in amr format can be successfully dow...
								
									
																														Firefox
																				chrome
																				html
																				php
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								Multiple choice questions, how to judge whether the chosen answer is the correct answer?
								
 I got a set of data, which is to choose the type of question. How can I tell if I have chosen the right one 
 answera:  "Olympic Games "  answerb:  "Asian Games "  answerc:  "Paralympic Games "  answerd:  "University Games "  id:  "1772 "  question:  "f...
								
									
																														Javascript
																				css
																				html
																			
									
										Feb.26,2021
									
								
							
														
								Read a number, such as 521, change this number to 0521, and put it into four div, how to achieve?
								
 read a number, such as 521 
 change this number to 0521 
 but put it into four div separately, how to realize it? 
  0 <   div >   5 <   div >   2 <   div >   1 <   div > 
...
								
									
																														Javascript
																				es6
																			
									
										Feb.26,2021
									
								
							
														
								React projects cannot save store? using redux, data
								
 react projects cannot save store? using redux, data 
 index.js 
ReactDOM.render(
  <Provider store={store}>
    <Router  >
  < Provider>, document.getElementById(  root  ))
registerServiceWorker()

 actions 

export const SET_USER =   ...
								
									
																														Javascript
																				react.js
																				redux
																			
									
										Feb.26,2021
									
								
							
														
								How to find all the 'NA' characters in a HMLT page and replace it with "and invalid"
								 how to find all the   NA   characters in a HMLT page and replace it with  "and invalid "  with native JS ...
								
									
																														Javascript
																			
									
										Feb.26,2021
									
								
							
														
								Why not pause after alert, but immediately refresh the address, this alert is written by yourself?
								  ...
								
									
																														Html
																				css
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								Can I use import and export directly?
								
 suppose there are only a.js and b.js (only two js and nothing else) 
 b.js export A variable is used for a.js 
 can you directly use import and export without using packaging and compilation tools such as webpack or babel 
 can it be achieved with the h...
								
									
																														Node.js
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								The problem of uploading attachments to the mobile version
								 do the gods have plug-ins for uploading attachments in the mobile version that can also be uploaded more than one? ...
								
									
																														Html5
																				node.js
																				css
																				html
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								WeChat Mini Programs login problem
								 what does the code circled in the following picture mean?   ...
								
									
																														Php
																				javascript
																			
									
										Feb.26,2021
									
								
							
														
								Ask a question about the jquery window object
								
 I look at a html ui project with items such as: 
 var apiserver = window[  apiserver  ];
 url = apiserver + "filterUrlController getUrlData";
 
 I searched the whole project and couldn  t find the value of window [  apiserver  ]. How do you un...
								
									
																														Javascript
																				jquery
																			
									
										Feb.26,2021
									
								
							
														
								The vue project introduces particles.js to realize the particle effect, but there is a problem when switching pages?
								
In the  vue-cli project, I directly introduced the particls library into index.html, and the related files are placed in the static directory .
<div id="particles-js">< div>
  
<script type="text javascript" src="s...
								
									
																														Front-end
																				javascript
																				vue.js
																			
									
										Feb.26,2021
									
								
							
														
								Js performs asynchronous operations in a loop and then adds each asynchronous result to an array. How can this array be used outside the loop?
								
  
How does the  code return only the result after the last asynchronous operation in the for loop is completed as shown in the figure? Please stop by and give me a hand. 
...
								
									
																														Javascript
																				promise
																				for-cycle
																			
									
										Feb.26,2021


				
					
						
	
						
		css
		mysql
		arrays
		josn
		react
		html
		typescript
		webpack
		npm
		sass
		R
		objective-c
		.net
		sql-server
		jquery
		python-3.x
		angularjs
		django
		angular
		excel
		regex
		iphone
		ajax
		linux
		xml
		pandas
		vba
		spring
		database
		wordpress
		string
		wpf
		xcode
		windows
		bash
		postgresql
		oracle
		multithreading
		eclipse
		list
		firebase
		algorithm
		macos
		forms
		image
		scala
		visual-studio
		azure
		bootstrap
		spring-boot
		react-native
		python-2.7
		docker
		performance
		function
		winforms
		matlab
		powershell
		apache
		dataframe
		api
		sqlite
		numpy
		rest
		shell
		selenium
		flutter
		dart
		maven
		loops
		qt
		swing
		android-studio
		csv
		express
		file
		class
		tensorflow
		sorting
		codeigniter
		perl
	
						MySQL Query :  SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5 
 MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b34a96-2bf14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") 
 MySQL Errno : 1021 
 Message :  Disk full (/tmp/#sql-temptable-64f5-1b34a96-2bf14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") 
Need Help?