简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Web Front-end > JS Tutorial > body text

js debugging tool console.log() method to view the execution of js code_javascript skills

WBOY
Release： 2016-05-16 16:40:00
Original
1244 people have browsed it

When I was debugging the code before, I usually checked the execution of the js code by using alert in the code block. Today I also saw a friend using the console.log function to print the output. Functions, variables, objects, the usage of console.log is recorded below. The specific syntax is: 

console.log("值为:",fn);
Copy after login

console.log() can output variables, functions, arrays, objects, etc.

<html> 
<head> 
<title>this关键字_函数调用</title> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head> 
<body> 

<input type="text" id="test1" name="firstname" value="" /> 
<input type="text" id='lastname' name='lastname' value=''> 

</body> 

<script type="text/javascript"> 
var testobj = 
{ 
'id': 1, 
'content': 'test', 
'firstname': function() { 
var EleFirst= document.getElementById('test1'); 
//document.getElementById('firstname').value = "zhang"; 
//document.getElementById("test1").value = this.content; 
//document.getElementById("test1").setAttribute("value","zhang"); 
//this.content = val; 
EleFirst.setAttribute("value",this.content); 
console.log("对象的值为：",test1);//对象的值为：<input type="text" id="test1" name="firstname" value="" /> 
}, 
'lastname': function() { 
document.getElementById('lastname').value = "ying"; 
} 
}; 
console.log(testobj);/** 打印对像**/ 

testobj.firstname(); 
testobj.lastname(); 
</script> 
</html>
Copy after login
Related labels：
Debugging tools
source：php.cn
Previous article：window.open opens a new page in js_Basic knowledge Next article：Two different ways to create classes and objects in JS_Basic knowledge
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
The page suddenly cannot pull css or bootstrap So I'm developing a page, I did part of it yesterday and it worked great, and today I cont...
From 2024-04-06 21:58:04
0
1
800
Sudoku checker not working? Can anyone help me identify the error? I tried everything on the online editor but still get the error. But when I do this on VSC...
From 2024-04-06 21:21:07
0
1
474
How to make floated elements stack vertically instead of horizontally in CSS? I'm trying to make a webpage with two columns, with main content on one side and additiona...
From 2024-04-06 20:45:26
0
2
386
Trouble getting specific statistics (Stats) from PokeAPI using Axios and Node.js I have a problem, I'm trying to use the PokemonAPI, but when I try to access the attack, H...
From 2024-04-06 18:46:35
0
1
464
Scatterplot points do not maintain values ​​when zooming in d3.js This is my first time using d3.js, so please bear with me. I implemented it as pure JavaSc...
From 2024-04-06 18:16:26
0
1
403
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！