深拷贝

1. JSON.stringify与JSON.parse

function deepClone(data) {
    let _data = JSON.stringify(data),
        dataClone = JSON.parse(_data);
    return dataClone;
};

2 对象与数组形式进深拷贝

function deepClone(source) {
  if (!source && typeof source !== 'object') {
    throw new Error('error arguments', 'deepClone')
  }
  const targetObj = source.constructor === Array ? [] : {}
  Object.keys(source).forEach(keys => {
    if (source[keys] && typeof source[keys] === 'object') {
      targetObj[keys] = deepClone(source[keys])
    } else {
      targetObj[keys] = source[keys]
    }
  })
  return targetObj
}