(function () {
  old_layer_tips = layer.tips

  layer.tips = function(content, follow, options) {
    old_success = options['success'] || function (the_tips, index) {}

    options['success'] = function(the_tips, index) {
      if ('offset' in options) {
        var oldTop = parseFloat(the_tips.css("top").replace('px', ''));
        var oldLeft = parseFloat(the_tips.css("left").replace('px', ''));
        var offset = options['offset']
        var offsetTop = parseFloat(String(offset[0]).replace('px', ''));
        var offsetLeft = parseFloat(String(offset[1]).replace('px', ''));
        the_tips.css({
          top: `${oldTop + offsetTop}px`,
          left: `${oldLeft + offsetLeft}px`
        })
      }

      old_success(the_tips, index)
    }

    return old_layer_tips(content, follow, options)
  }
})(layer)

layer.tips('显示在目标元素上方', '#id', {
  tips: 1,
  offset: ['-50px', '100px']
});