whole_func_string: function _removeClass( element, cName ){  
      if (!element) return;
      if (typeof element.className === 'string') {
        if( _hasClass( element,cName ) ){  
          element.className = element.className.replace( new RegExp( "(\\s|^)" + cName + "(\\s|$)" )," " ); // replace方法是替换 
          // trim.
          element.className = stringUtils.trim(element.className);
        };  
      }
    }
func_code_string: function _removeClass( element, cName ){  
      if (!element) return;
      if (typeof element.className === 'string') {
        if( _hasClass( element,cName ) ){  
          element.className = element.className.replace( new RegExp( "(\\s|^)" + cName + "(\\s|$)" )," " ); // replace方法是替换 
          // trim.
          element.className = stringUtils.trim(element.className);
        };  
      }
    }
func_documentation_string: removeClass