JavaScript 用例

In this post we explore basic javascript use cases.

1. Add class to element in JavaScript

<div id="box"></div>

const element = document.querySelector("#box");

// Note: only class name, without the '.'
element.classList.add("class-name");

2. Call a function in JavaScript

function greetUser() {
  return "Welcome to code to go!";
}

let result = greetUser();

console.log(result);

Output:

Welcome to code to go!

3. Capitalize first letter in JavaScript

let str = "uvais codes";

str = str[0].toUpperCase() + str.substring(1);

Output:

Uvais codes

4. Change CSS property in JavaScript

<div id="box"></div>

const element = document.querySelector("#box");

//change background-color
element.style.backgroundColor = "red";

5. Convert JSON to string in JavaScript

const object = {
  id: 1,
  name: "Leanne Graham"
};

JSON.stringify(object);

Output"

{"id":1,"name":"Leanne Graham"}

Thanks for Reading

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