Green-JEONG / Web

Web 프로그래밍 학습

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[Updated] JavaScript(web2)_9 #19

Open Green-JEONG opened 3 months ago

Green-JEONG commented 3 months ago

1. Grammar of Conditional Statements (조건문 문법)

(1) if statement:

If statement is followed by the boolean data.
True: The value before 'else' is returned.
False: The value after 'else' is returned.

2. Utilization of Conditional Statements (조건문 활용)

'javascript element get value' (1) Search in Console.

> document.querySelector('#night_day')
< <input id="night_day" type="button" value="night" onclick="
if () {
  document.querySelector('body').style.backgroundColor = 'black';
  document.querySelector('body').style.color = 'white';
} else {
  document.querySelector('body').style.backgroundColor = 'white';
  document.querySelector('body').style.color = 'black';
}
">

> document.querySelector('#night_day').value
< 'night'

We can get the value of tag with an Id value of 'night_day'

Green-JEONG commented 3 months ago

It took a total of 10 minutes.