1.先建CSS
.required {
background-image:url(../pic/bitian.gif) !important;
background-repeat:no-repeat;
background-position:left;
padding-left:12px;
}
2.在创建的field里加入CSS
xtype: 'textfield',
value: '50,000',
anchor: '100%',
cls:'required',
fieldLabel: ' {MOD}结算'