牛逼哄哄的对象深复制

      function cloneObj(source, target) {
        if (!target) {
          if (source.constructor === RegExp) {
            target = new RegExp(source.source, source.flags)
          } else {
            target = new source.constructor()
          }
        }
        var names = Object.getOwnPropertyNames(source)
        for (var i = 0; i < names.length; i++) {
          var desc = Object.getOwnPropertyDescriptor(source, names[i])
          if (typeof desc.value === 'object' && desc.value !== null) {
            var values = cloneObj(desc.value)
            Object.defineProperty(target, names[i], {
              enumerable: desc.enumerable,
              configurable: desc.configurable,
              writable: desc.writable,
              value: values
            })
          } else {
            Object.defineProperty(target, names[i], desc)
          }
        }
        return target
      }

 

      function deepClone(obj = {}) {
        if (typeof obj !== 'object' || obj == null) return obj
        let result
        result = obj instanceof Array ? [] : {}
        for (let key in obj) {
          if (obj.hasOwnProperty(key)) result[key] = deepClone(obj[key])
        }
        return result
      }