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5_it_statement.html
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5_it_statement.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>if_statement</title>
</head>
<body>
<script type="text/javascript">
//if statement'
if(true){
console.log("if statement is true");
}
if(false){
console.log("none");
}
//
if(false){
console.log("if else false");
}else{
console.log("if else true statement");
}
//
var numtest = 0;
if(numtest !==0){
console.log("numtest !== 0");
}else if(numtest === 0){
console.log("numtest === 0");
}
else{
console.log("test");
}
//
var macok = prompt('이것은 강민석의 맥북입니까?');
console.log(macok);
//
alert(prompt('계속 하려면 뭐든 누르세요.'));
// &&, ||
//
if(''){
console.log("if문에 '' 를 넣었다.");
}
if(undefined){
console.log("undefined is true?");
}
</script>
</body>
</html>