Viewing: developer.mozilla.org

[ Web Proxy ]

Viewing: https://developer.mozilla.org/zh-TW/docs/Learn_web_development/Howto/Solve_JavaScript_problems

[Back] [Original]

JavaScript - Web | MDN

Toggle sidebar

Theme

OS default
Light
Dark

()

Remember language Learn more

In this article

undefined


`getElementsByTagName()`	`getElementbyTagName()`
`getElementsByName()`	`getElementByName()`
`getElementsByClassName()`	`getElementByClassName()`
`getElementById()`	`getElementsById()`


`elem.style.color = 'red';`	`elem.style.color = 'red;'`

js

function myFunction() {
  alert("");
}

js

myFunction();

return

JavaScript return

return error Firefox unreachable code after return statement

JavaScript

js

const myNumber = 0;

js

const myObject = {
  name: "Chris",
  age: 38,
};

JavaScript

JavaScript

JavaScript

JavaScript JavaScript error error

/

while do ... while

functionmethod)

JSON

addEventListener()

JavaScript

JavaScript

Web API

JavaScript DOM

Help improve MDN

Was this page helpful to you?

Yes No

Learn how to contribute

This page was last modified on 2025424 by MDN contributors.

View this page on GitHub Report a problem with this content

Web Proxy Viewer | New URL | Original Page