code: function (el, htOption) {
      		this._bIsPainted = false;
      		this._android = _getAndroid();
  		
  			this._htOption = htOption;
  			this._elCanvas = document.createElement("canvas");
  			this._elCanvas.width = htOption.width;
  			this._elCanvas.height = htOption.height;
  			el.appendChild(this._elCanvas);
  			this._el = el;
  			this._oContext = this._elCanvas.getContext("2d");
  			this._bIsPainted = false;
  			this._elImage = document.createElement("img");
  			this._elImage.alt = "Scan me!";
  			this._elImage.style.display = "none";
  			this._el.appendChild(this._elImage);
  			this._bSupportDataURI = null;
  		}
docs: Drawing QRCode by using canvas
  
  @constructor
  @param {HTMLElement} el
  @param {Object} htOption QRCode Options