code: function checkMiniStyle(target, first) {
  		if (!target || typeof target !== 'object' || Array.isArray(target)) {
  			return null;
  		}
  		var missing = [];
  		var styleNames = getStyleNames();
  		for (var i = 0; i < styleNames.length; i++) {
  			if (typeof target[styleNames[i]] !== 'function') {
  				if (first) {
  					return null;
  				}
  				missing.push(styleNames[i]);
  			}
  		}
  		return missing;
  	}
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