Learning JavaScript from zero foundation should start with practice and start writing running code to cultivate interest. The specific steps include: 1. Starting from a small HTML JS project, mastering basic DOM operations; 2. Disassemble and practice basic syntax such as variables, conditional judgments, loops, functions, etc.; 3. Learn to use console.log() and developer tools to debug code; 4. Complete simple tasks to build confidence, such as judging age, traversing arrays, and displaying object information; 5. Consider the learning framework after a solid foundation. The focus is on more hands-on, less theory, and promote the learning process through a sense of accomplishment.
If you want to learn JavaScript with no foundation, the most practical way to start is to write code that can run, and then understand the logic behind it . Don’t read books or read tutorials that are too deep as soon as you come up, as it will easily get stuck and lose interest. First, do some small functions, such as popping a prompt box and changing the text color, so that you can feel the sense of accomplishment of "I can make the web page move", which is more important than anything else.
Start with a small HTML JS project
JavaScript is a language used to manipulate web content, so you need to understand HTML and basic DOM (document object model) structure first. It is recommended not to use frameworks at the beginning, just write simple HTML pages in the browser and add the <script></script> tag to write JS.
For example:
<!DOCTYPE html>
<html>
<body>
<button onclick="sayHello()">Click me</button>
<script>
function saysHello() {
alert("Hello, JS is starting!");
}
</script>
</body>
</html> This small interaction will allow you to see the effect quickly and can also help you understand basic concepts such as functions and events. The key is to write and try it while you encounter problems, and check MDN or Stack Overflow.
Split the basic grammar into small pieces to practice
At the beginning, you don’t need to remember all the grammar, just choose a few key points and practice repeatedly:
- Variables: the difference between let and const
- Conditional judgment: if/else, ternary operator
- Loop: for, while, forEach
- Function: Declarative vs Expressions
- Basic operations of objects and arrays
You can set some small tasks for yourself, such as:
- Write a function to determine whether the user input age is greater than 18
- Iterate through an array and splice the names inside into a sentence
- Save user information with objects and display it
These tasks are not complicated, but they can help you build confidence and basic thinking.
Learning to debug is the key ability
JavaScript is not like math problems, you will know right or wrong after writing it. Many times you "look at it and you have to rely on debugging.
- Use
console.log() to output variables more frequently to see if the value is correct
- Break points in browser developer tools
- Check if there is any error message on the console
Many people get stuck not because the code is difficult, but because they don’t know how to find the problem. Develop debugging habits early, and it will be much easier to learn advanced content later.
Don't rush to learn the framework
Many novices start learning React as soon as they learn variables, but end up learning in a fog. In fact, frameworks are just tools, and the real foundation is whether you can solve problems with native JS.
When you can write a complete small application like a small calculator, to-do list, or something, it's not too late to get in touch with the framework.
Basically that's it. Getting started with JS is not difficult. The key is not to be greedy, write more code, or check if there are any problems. You will find it is not as terrible as you think.
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