一.本地模式
  var articlekind = new Ext.form.ComboBox({
                                         fieldLabel : '部门',  //UI标签名称
                                         name : 'identity',   //作为form提交时传送的参数名
                                         allowBlank : false,  //是否允许为空
                                         mode : 'local',      //数据模式, local为本地模式, 如果不设置,就显示不停的加载中...
                                         readOnly : true,     //是否只读
                                         triggerAction : 'all',  //显示所有下列数.必须指定为'all'
                                         anchor : '90%',
                                         emptyText:'请选择...',  //没有默认值时,显示的字符串
                                         store : new Ext.data.SimpleStore({  //填充的数据
                                                           fields : ['text', 'value'],
                                                           data : [['t1', 'v1'], ['t2', 'v2'], ['t3', 'v3']]
                                         }),
                                         value:'t2',  //设置当前选中的值, 也可用作初始化时的默认值, 默认为空  
                                         valueField : 'value',      //传送的值
                                         displayField : 'text',     //UI列表显示的文本
                                         regex : /[\u4e00-\u9fa5]/,   //只能输入中文. 正则表达式验证:详见: http://www.blogjava.net/algz/articles/263284.html
                                         regexText : "只能输入中文!"       //使用正则表达式时,设置的错误提示
                                 });

五个必须项.
 
二.远程模式
//author.json页面:    {author : [{text : "t1" , value : "v1" } , {text : "t2" , value : "v2" }]}
  var remoteComboBox= new Ext.form.ComboBox({
                                         fieldLabel : '部门',  //UI标签名称
                                         name : 'identity',   //作为form提交时传送的参数名
                                         allowBlank : false,  //是否允许为空
                                         mode : "remote",      //数据模式为远程模式, 也可不设置,即默认值也为remote
                                         readOnly : true,     //是否只读
                                         triggerAction : 'all',  //显示所有下列数.必须指定为'all'
                                         anchor : '90%',
                                         emptyText:'请选择...',   //没有默认值时,显示的字符串
                                         store : new Ext.data.JsonStore({  //填充的数据
                                                           url : "author.json",
                                                           fields : new Ext.data.Record.create( ['text', 'value']),   //也可直接为["text","value"]
                                                           root : "author"
                                         }),
                                         value:'v2',  //设置当前选中的值, 也可用作初始化时的默认值, 默认为空
                                         valueField : 'value',  //传送的值
                                         displayField : 'text'  //UI列表显示的文本
                                 });