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- Outputting A Single Object
- Outputting Multiple Objects
- Using String Substitutions
- Styling Console Output
The simplest way to use the logging methods is to output a single object: The output looks something like this:
You can also output multiple objects by listing them when calling the logging method, like this: The output will look like this:
When passing a string to one of the console object's methods that accepts a string (such as console.log()), you may use these substitution strings: %o or %O 1. Outputs a JavaScript object. Clicking the object name opens more information about it in the inspector. %d or %i 1. Outputs an integer. Number formatting is supported, for example console.lo...
You can use the %cdirective to apply a CSS style to console output: The text before the directive will not be affected, but the text after the directive will be styled using the CSS declarations in the parameter. You may use %cmultiple times: The properties usable along with the %csyntax are as follows (at least, in Firefox — they may differ in oth...
Mar 6, 2024 · This means that the log message shows the content of an object at the time when it's first viewed, not when it was logged. For example: js. const obj = {}; console.log(obj); obj.prop = 123; This will output {}. However, if you expand the object's details, you will see prop: 123. If you are going to mutate your object and you want to prevent the ...
Jun 1, 2017 · console.log prints the element in an HTML-like tree; console.dir prints the element in a JSON-like tree; Specifically, console.log gives special treatment to DOM elements, whereas console.dir does not. This is often useful when trying to see the full representation of the DOM JS object.
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Outputting text to the console. The most frequently-used feature of the console is logging of text and other data. There are four categories of output you can generate, using the console.log(), console.info(), console.warn(), and console.error() methods.
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