jquery live 区别

后来jQuery更新到1.9.1，页面中的.live报错:"has no method live", 后来查了文档才知道在新版本中做了修改。

jQuery.1.8.1：

$("#liveID").live("click",function(){alert("live click");});

jQuery.1.9.1：

$(document).on("click","#liveID",function(){alert("live click");});

jQuery网站上这么说的：

As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().

This method provides a means to attach delegated event handlers to the document element of a page, which simplifies the use of event handlers when content is dynamically added to a page. See the discussion of direct versus delegated events in the.on() method for more information.

改进后的使用建议：

1 $(selector).live(events, data, handler); // jQuery 1.3+

2 $(document).delegate(selector, events, data, handler); // jQuery 1.4.3+

3 $(document).on(events, selector, data, handler); // jQuery 1.7+

示例：
1 $("a.offsite").live("click", function(){ alert("Goodbye!"); }); // jQuery 1.3+

2 $(document).delegate("a.offsite", "click", function(){ alert("Goodbye!"); }); // jQuery 1.4.3+

3 $(document).on("click", "a.offsite", function(){ alert("Goodbye!"); }); // jQuery 1.7+