https://juejin.cn/post/6844903929705136141 JSON.parse(JSON.stringify()); 粗略版 ``` module.exports = function clone(target) { if ( Object.toString.call(target) === '[object Object]') { let cloneTarget = Array.isArray(target) ? [] : {}; for (const key in target) { cloneTarget[key] = clone(target[key]); } return cloneTarget; } else { return target; } }; ```