new Ext.form.NumberField({                       id: "txtIssuedNum",                       fieldLabel: '<% = GetLocalResourceObject("WriteAddRecordText") %>',                       allowDecimals: false,               //不允许输入小数                         nanText: '<% = GetLocalResourceObject("WriteIntText") %>',           //无效数字提示                         allowNegative: false,              //不允许输入负数                         maxValue: 100,                       //最大值                         minValue: 1,                        //最小值                         enableKeyEvents: true, // 要有                       listeners: {                           keyup: function () {                               var num = Ext.getCmp("txtIssuedNum").getValue();                               if (num < 1) return false;                               var count = ds.getCount();                               if (count == num) { return false; }                               else if (count < num) {                                   var o = num - count;                                   for (var i = 0; i < o; i++) {                                       var iss = new ds.recordType({                                           ISSBANK: "x",                                           ISSBRANCHBANK: "xx",                                           CARDNUM: "xxx",                                           CARDHOLDER: "xxxx",                                           AMOUNT: 0.00,                                           MERDETAILREFNUM: "xxxx",                                           MERREMARK: "xxxxxx"                                       });                                       ds.addSorted(iss);                                   }                               }                               else {                                   var oo = count - num;                                   for (var i = 0; i < oo; i++) {                                       ds.remove(ds.getAt(count - oo));                                   }                               }                           }                       }                   })

change

new Ext.form.NumberField({                       id: "txtIssuedNum",                       fieldLabel: '<% = GetLocalResourceObject("WriteAddRecordText") %>',                       allowDecimals: false,               //不允许输入小数                         nanText: '<% = GetLocalResourceObject("WriteIntText") %>',           //无效数字提示                         allowNegative: false,              //不允许输入负数                         maxValue: 100,                       //最大值                         minValue: 1,                        //最小值                         enableKeyEvents: true,   //可以不要                       listeners: {                           change: function () {                               var num = Ext.getCmp("txtIssuedNum").getValue();                               if (num < 1) return false;                               var count = ds.getCount();                               if (count == num) { return false; }                               else if (count < num) {                                   var o = num - count;                                   for (var i = 0; i < o; i++) {                                       var iss = new ds.recordType({                                           ISSBANK: "x",                                           ISSBRANCHBANK: "xx",                                           CARDNUM: "xxx",                                           CARDHOLDER: "xxxx",                                           AMOUNT: 0.00,                                           MERDETAILREFNUM: "xxxx",                                           MERREMARK: "xxxxxx"                                       });                                       ds.addSorted(iss);                                   }                               }                               else {                                   var oo = count - num;                                   for (var i = 0; i < oo; i++) {                                       ds.remove(ds.getAt(count - oo));                                   }                               }                           }                       }                   })

 添加一个延时触发的例子

var fun;    var txt = new Ext.form.TextField({        id: "txt",        fieldLabel: "用户名称",        enableKeyEvents: true,        listeners: {            keyup: function () {                clearTimeout(fun);                fun = setTimeout(function () {                    var text = Ext.getCmp("txt").getValue();                    alert(text);                }, 500);            }        }    });    txt.render(Ext.getBody());