code: function(options) {
  			var self = this;
  			self.options = options || {};
  			self.options.buttons = self.options.buttons || ['取消', '确定'];
  			self.panel = $.dom(panelBuffer)[0];
  			document.body.appendChild(self.panel);
  			self.ok = self.panel.querySelector('.mui-poppicker-btn-ok');
  			self.cancel = self.panel.querySelector('.mui-poppicker-btn-cancel');
  			self.body = self.panel.querySelector('.mui-poppicker-body');
  			self.mask = $.createMask();
  			self.cancel.innerText = self.options.buttons[0];
  			self.ok.innerText = self.options.buttons[1];
  			self.cancel.addEventListener('tap', function(event) {
  				self.hide();
  			}, false);
  			self.ok.addEventListener('tap', function(event) {
  				if (self.callback) {
  					var rs = self.callback(self.getSelectedItems());
  					if (rs !== false) {
  						self.hide();
  					}
  				}
  			}, false);
  			self.mask[0].addEventListener('tap', function() {
  				self.hide();
  			}, false);
  			self._createPicker();
  			//防止滚动穿透
  			self.panel.addEventListener($.EVENT_START, function(event) {
  				event.preventDefault();
  			}, false);
  			self.panel.addEventListener($.EVENT_MOVE, function(event) {
  				event.preventDefault();
  			}, false);
  		}
docs: 构造函数