簡單深拷貝

function deepCopy(p, c) {
    var c = c || {};
    for (var i in p) {
      if (typeof p[i] === 'object') {
        c[i] = (p[i].constructor === Array) ? [] : {};
        deepCopy(p[i], c[i]);
      } else {
         c[i] = p[i];
      }
    }
    return c;
  }
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