json深拷贝

function recursiveDeepCopy(o) {
    var newO, i;
  
    if (typeof o !== 'object') {
      return o;
    }

    if (!o) {
      return o;
    }
  
    if ('[object Array]' === Object.prototype.toString.apply(o)) {
      newO = [];
      for (i = 0; i < o.length; i += 1) {
        newO[i] = recursiveDeepCopy(o[i]);
      }
      return newO;
    }
  
    newO = {};
    for (i in o) {
      if (o.hasOwnProperty(i)) {
        newO[i] = recursiveDeepCopy(o[i]);
      }
    }
    return newO;
  }

function jsonDeepCopy(o) {
    return JSON.parse(JSON.stringify(o));
}

function objectClone(o) {
      var r, f;
      if( o == null || typeof(o) != 'object' ) return o;
      f = function() {}; f.prototype = o;
      r = new f;
      for( var i in o) r[i] = objectClone(o[i]);
      return r;
  }

function recursiveDeepCopy2(o) {
    var newO,  i;
  
    if (typeof o !== 'object') {  return o; }
    if (!o) {  return o;  }
  
    if ( o.constructor === Array ) {
      newO = [];
      for (i = 0; i < o.length; i += 1) {
        newO[i] = recursiveDeepCopy2(o[i]);
      }
      return newO;
    }
  
    newO = {};
    for (i in o) {
        newO[i] = recursiveDeepCopy2(o[i]);
    }
    return newO;
  }