<!DOCTYPE html> <html> <head> <title>ExtJs</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <link rel="stylesheet" type="text/css" href="ExtJs/packages/ext-theme-crisp/build/resources/ext-theme-crisp-all.css"> <script type="text/javascript" src="ExtJs/ext-all.js"></script> <script type="text/javascript" src="ExtJs/bootstrap.js"></script> <script type="text/javascript" src="ExtJs/packages/ext-theme-crisp/build/ext-theme-crisp.js"></script> </head> <body> <script type="text/javascript"> Ext.onReady(function() { var item = new Ext.util.MixedCollection(); item.on('add', function(index, o, key){ Ext.Msg.alert('notice', '当前有对象加入,加入后的index是:' + index + '该对象的name是: ' + o.name + '加入对应的key是:' + key); }); item.add('obj2key', {name: 'nobj2name'}); }); </script> </body> </html>