Tip dialog jQuery plugin

You are using several global variables in the code, which should be local.

You are prefixing variable names with $ for no apparent reason, that only makes the code harder to read.

You can use the || operator instead of the conditional operator to check for missing values.

You are using the variable _refresh in the code, I assume that it should be the variable that you defined instead.

$.extend({
  misTip : function(tipSettings) {
    var tip = tipSettings.tip || '';
    var closeTime = tipSettings.closeTime || 1500;
    var refresh = tipSettings.refresh;

    delete tipSettings.msg;
    delete tipSettings.closeTime;
    delete tipSettings.refresh;

    //dialog ui tip
    var tpl =
      '<div style="padding:5px 20px">' +
      '<p style="font-size:14px;padding-top:10px;"><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 20px 0;"></span><span class="ajaxMsg">' + tip + '</span></p>' +
      '</div>';

    var defaultTipSettings = {
      title : 'notice',
      slow : 'slide',
      width : 320,
      open : function (event, ui) {
        $(this).bind("keypress",function(){
          $(this).dialog('close');
        });
        var dialog = $(this);
        setTimeout(function(){
          dialog.dialog('close');
          if (refresh) {
            refresh();
          }
        }, closeTime);
      }
    }
    var settings = $.extend(defaultTipSettings, tipSettings);
    $(tpl).dialog(settings);
  }
});