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* JSON ๊ฐ์ฒด์ parse
String -> Object : String ๊ฐ์ฒด๋ฅผ json ๊ฐ์ฒด๋ก ๋ณํ
who, loginVO.getId()๋ ์ธ์๊ฐ์ผ๋ก ๊ฐ์ด ๋ด๊ฒจ์๋ค.
JSON ๊ฐ์ฒด๋ ์ค๊ดํธ({})๋ก ๋๋ฌ์์ ํํ
๋ํ, JSON ๊ฐ์ฒด๋ ์ผํ(,)๋ฅผ ์ฌ์ฉํ์ฌ ์ฌ๋ฌ ํ๋กํผํฐ๋ฅผ ํฌํจ
TextMessage tmpMsg = new TextMessage("{\"code\" : \""+ who +"\", \"id\" : \""+ loginVO.getId() +"\"}");

var msg = JSON.parse(event.data);
console.log("msg :::::::::::",msg);

* JSON ๊ฐ์ฒด์ stringify
Object -> String : json ๊ฐ์ฒด๋ฅผ String ๊ฐ์ฒด๋ก ๋ณํ
who๋ ์ธ์๊ฐ์ผ๋ก ๊ฐ์ด ๋ด๊ฒจ์๋ค.
TextMessage tmpMsg = new TextMessage(who);
var msg = JSON.parse(JSON.stringify(event.data));
console.log("msg :::::::::::",msg);

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