// 輸入框textfield后面放字unitText定義:
Ext.override(Ext.form.TextField, {
unitText : '',
onRender : function(ct, position) {
Ext.form.TextField.superclass.onRender.call(this,ct, position);

if (this.unitText != ''){
this.unitEl =ct.createChild({
tag: 'div',
html: this.unitText this.unitEl.addClass('x-form-unit'); this.width =this.width
-(this.unitText.replace(/[^/x00-/xff]/g, "xx").length * 6 +2); this.alignErrorIcon= function() {
this.errorIcon.alignTo(this.unitEl,'tl-tr', [2, 0]); }});

<style>
.x-form-unit{
height:22px;
line-height:22px;
padding-left:2px;
display:inline-block;
display:inline; </style>
<script type="text/javascript"src="UnitText.js"></script>

var jine = new Ext.form.NumberField({
id: 'je',
fieldLabel: '金額',
allowDecimals: true, // 允許小數點？
allowNegative: false, // 允許負數？
width: 100,
style: 'text-align:right',
unitText: ' 元'
});