JS对象的深拷贝

方法一：标准版

function deepCopy(obj) {
  if (typeof obj !== 'object' && obj != null) return obj;

  var result = Array.isArray(obj) ? [] : {};
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (typeof obj[key] === 'object' && obj[key] !== null) {
        result[key] = deepCopy(obj[key]);   //递归复制
      } else {
        result[key] = obj[key];
      }
    }
  }
  return result;
}

方法二：大同小异，精简版

  Object.prototype.clone = function () {
    var o = this.constructor === Array ? [] : {};
    for (var e in this) {
      o[e] = typeof this[e] === "object" ? this[e].clone() : this[e];
    }
    return o;
  }