How to use 'object inside object javascript' in JavaScript

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function Object_1( value ) {
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  this.array = value.split(",");
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  this.length = this.array.length;
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  for ( var i = 0; i < this.length; i++ ) {
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    this[i] = eval(this.array[i]);
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  }
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  this.join = Array.prototype.reverse;
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  this.getClass = Object.prototype.toString;
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}

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static jsify(object) {
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  if (!dart.is(object, core.Map) && !dart.is(object, core.Iterable)) {
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    dart.throw(new core.ArgumentError("object must be a Map or Iterable"));
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  }
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  return _wrapToDart(JsObject._convertDataTree(object));
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}