[Modifiy]Data input is possible

 const puppeteer  = require("puppeteer");
 function login(id, pw) {
   const crawler = async() => {
-      try{
-          const browser = await puppeteer.launch({headless: false, args:['--window-size=1920,1080']});
-          // for observing the process of login, headless -> false
-          const page = await browser.newPage();
-          await page.setViewport({
-              width:1920,
-              height:1080
-          })
-          await page.goto('https://e-campus.khu.ac.kr/xn-sso/login.php?auto_login=&sso_only=&cvs_lgn=&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Fxn-sso%2Fgw-cb.php%3Ffrom%3D%26login_type%3Dstandalone%26return_url%3Dhttps%253A%252F%252Fe-campus.khu.ac.kr%252Flogin%252Fcallback');
-          await page.evaluate(() => {
-              document.querySelector("#login_user_id").value = id
-              document.querySelector("#login_user_password").value = pw
-              document.querySelector('#form1 > div > div.login_btn > a > span').click();
-          })
-          await page.waitForTimeout(500);
-
-      }catch(err){
-          console.log(err)
-      }
-      if(page.url() === 'https://e-campus.khu.ac.kr/xn-sso/login.php?auto_login=&sso_only=&cvs_lgn=&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Fxn-sso%2Fgw-cb.php%3Ffrom%3D%26login_type%3Dstandalone%26return_url%3Dhttps%253A%252F%252Fe-campus.khu.ac.kr%252Flogin%252Fcallback'){
-        return "the account id or password you entered is incorrect";}
-      else {
-        return `I got data { id:"${id}"  pw:"${pw}" }`;
-      }
+    try{
+        const browser = await puppeteer.launch({headless: false, args:['--window-size=1920,1080']});
+        const page = await browser.newPage();
+        await page.setViewport({
+            width:1920,
+            height:1080
+        })
+        await page.goto('https://e-campus.khu.ac.kr/xn-sso/login.php?auto_login=&sso_only=&cvs_lgn=&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Fxn-sso%2Fgw-cb.php%3Ffrom%3D%26login_type%3Dstandalone%26return_url%3Dhttps%253A%252F%252Fe-campus.khu.ac.kr%252Flogin%252Fcallback');
+        await page.type("#login_user_id", id);
+        await page.type("#login_user_password", pw);
+        await page.click('#form1 > div > div.login_btn > a > span');
+        if(page.url() === 'https://e-campus.khu.ac.kr/xn-sso/gw-cb.php?from=&login_type=standalone&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Flogin%2Fcallback'){
+          return "Incorrect user ID or password."
+        }
+        else {
+          return `I got data { id:"${id}"  pw:"${pw}" }`;
+        }
+    }catch(err){
+        console.log(err)
+    }
   }
+
   crawler();
 }