topic description
write an expression that results in whether 2018 is a leap year.
related codes
function isLeapYear(year){
if(typeof year != "number"){
return console.log("");
}else{
if((year%4==0)&&(year%100!=0)||(year%400==0)){
return console.log(year+"");
}else{
return console.log(year+"");
}
}
}
isLeapYear(asd);what result do you expect? What is the error message actually seen?
according to my code, if the input is not a number, it will prompt "the input is not a number"
, but if you write asd directly in the value, it will report an error "ReferenceError: asd is not defined"
and add quotation marks. What is the reason? if you want to enter a value directly in it (without quotation marks), you will be prompted how to "enter a number instead of a number"