Web Front-end
JS Tutorial
Detailed explanation of js console.log printing object and array usage
Detailed explanation of js console.log printing object and array usage
The example in this article describes the usage of js console.log printing objects and arrays. Share it with everyone for your reference, the details are as follows:
What is console.log? It is actually just a function for printing js arrays and objects, just like PHP's print_r, var_dump. There is nothing much to say about the console.log function itself. This blog will tell you how to use this function. Before talking about this function, I think what everyone uses most to view js output is alert, but alert can only play string or int
1. Test file test.html
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>console.log test</title>
</head>
<script type="text/javascript">
var testobj =
{
'id': 1,
'content': 'test',
'firstname': function() {
document.getElementById('firstname').value = "zhang";
},
'lastname': function() {
document.getElementById('lastname').value = "ying";
}
};
<!-- 打印对像 -->
console.log(testobj);
</script>
<body>
<input type="text" id='firstname' name="firstname" value=''>
<input type="text" id='lastname' name='lastname' value=''>
</body>
</html>2. Chrome development tools view js objects
console chrome
Now when I use chrome developer tools and firebug, they are half and half. Chrome developer tools also have a function that firebug does not have.
The console can run js. If the page is an iframe, firebug can only run on the parent, and chrome can select the page inside to execute. , if the picture below
chrome iframe console
3. Firebug view js object
firebug console
I hope this article will be helpful to everyone in JavaScript programming.
For more js console.log printing objects and array usage details, please pay attention to the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1379
52
How do I create and publish my own JavaScript libraries?
Mar 18, 2025 pm 03:12 PM
Article discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.
How do I optimize JavaScript code for performance in the browser?
Mar 18, 2025 pm 03:14 PM
The article discusses strategies for optimizing JavaScript performance in browsers, focusing on reducing execution time and minimizing impact on page load speed.
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
How do I debug JavaScript code effectively using browser developer tools?
Mar 18, 2025 pm 03:16 PM
The article discusses effective JavaScript debugging using browser developer tools, focusing on setting breakpoints, using the console, and analyzing performance.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How do I use source maps to debug minified JavaScript code?
Mar 18, 2025 pm 03:17 PM
The article explains how to use source maps to debug minified JavaScript by mapping it back to the original code. It discusses enabling source maps, setting breakpoints, and using tools like Chrome DevTools and Webpack.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
