const list= {name: 'lisi',age: 14,id: 1} JSON.stringify(list, null, " ")
let list= "{name: 'lisi',age: 14,id: 1}" list = JSON.parse(list) JSON.stringify(list, null, " ")
{ name: 'lisi', age: 14, id: 1 }
js格式化json字符串和json对象