Key points on February 15, 2022

if else There can be no other code in the middle . Need to be close , Otherwise it will go wrong

Variable Initial lowercase , Other initials are capitalized     This is the norm

document.querySelector('#slogan').innerText=' have pupils everywhere , Be strange by oneself ';   Text This T It's capital . No lowercase 

; stay } In front of , Represents the end of the expression

if (weekDay == 1) {
	window.document.writeln(' Today is Monday ');
	} else if (weekDay == 2) {
	window.document.writeln(' Today is Tuesday ');
	} else if (weekDay == 3) {
	window.document.writeln(' Today is Wednesday ');
	} else if (weekDay == 4) {
	window.document.writeln(' Today is Thursday ');
	} else if (weekDay == 5) {
	window.document.writeln(' Today is Friday ');
	} else if (weekDay == 6) {
	window.document.writeln(' Today is Saturday ');
	} else {
	window.document.writeln(' Today is Sunday ');
	}