원본 데이터[ { id: 1, name: 'John Doe', email: 'john.doe@example.com', age: 31 }, { id: 2, name: 'Jane Smith', email: 'jane.smith@example.com', age: 26 }]적용JSON.stringify(value, replacer, space)alert(`Saved ${changes.length} records:\n${JSON.stringify(changes, null, 4)}`);결과[ { "id": 1, "name": "John Doe", "email": "john.doe@example.com", "age": 31 }, { ..

json 형태인 경우JSON.stringify(object)TypeError: Converting circular structure to JSON가 발생하는 경우# 1단계let form = this.up('form').getForm();let fields = form.getFields(); fields.each(function(field) { let keys = Object.keys(field); keys.forEach(function(key) { console.log(key +": "+ field[key]); });});# 2단계let form = this.up('form').getForm();let fields = form.getFields();fields.each(function(fiel..