객체
객체(Object)
객체 = {'key' : value}객체의 생성
let grades = {};
let grades = new object();
let grades = {'egoing': 10, 'k8805': 6, 'sorialgi': 80};
//egoing은 key가 되고, 10은 value가 됨
grades['egoing'] = 10;
grades.egoing = 10;1. for ~ in
let obj = {'egoing': 10, 'k8805': 6, 'sorialgi': 80};
for(key in obj) {
document.write("key : "+key+" value : "+obj[key]+"<br />");
}2. 객체지향 프로그래밍
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