function fn_validate(){
		const frmLogin = document.frmLogin;		//form name
		const user_id = frmLogin.user_id.value;		//frmLogin ํผ์— ์žˆ๋Š” ์•„์ด๋””์™€ ๋น„๋ฒˆ
		const user_pw = frmLogin.user_pw.value;
		
		if ((user_id.length == 0 || user_id == "")||   //๋งŒ์•ฝ ์•„์ด๋””์— ์ž…๋ ฅ๊ฐ’์ด ์—†๊ฑฐ๋‚˜ ๊ธธ์ด๊ฐ€ 0์ด๋ฉด (๋˜๋Š”)
				(user_pw.length == 0 || user_pw == "")){   //๋งŒ์•ฝ ๋น„๋ฐ€๋ฒˆํ˜ธ ์ž…๋ ฅ๊ฐ’์ด ์—†๊ฑฐ๋‚˜ ๊ธธ์ด๊ฐ€ 0์ด๋ฉด
			alert("์•„์ด๋””์™€ ๋น„๋ฐ€๋ฒˆํ˜ธ๋Š” ํ•„์ˆ˜ ์ž…๋‹ˆ๋‹ค.");
		}else{
			frmLogin.method = "post";
			frmLogin.action = "login5";		//login5์„œ๋ธ”๋ฆฟ์œผ๋กœ ์„ค์ •ํ•ด๋ผ
			frmLogin.submit();				//์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์—์„œ ์„œ๋ธ”๋ฆฟ์œผ๋กœ ์ „์†กํ•ด๋ผ
		}
	}       

//htmlํ™”๋ฉด
<body>
	<form name="frmLogin" method="post" action="login">
		์•„์ด๋””: <input type="text" name="user_id"><br>
		๋น„๋ฐ€๋ฒˆํ˜ธ: <input type="password" name="user_pw"><br>
		<input type="submit" onclick="fn_validate()" value="๋กœ๊ทธ์ธ">
		<input type="reset" value="๋‹ค์‹œ์ž…๋ ฅ">	
	</form>
</body>

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