label添加click事件
Ext.form.Label.prototype.afterRender = Ext.form.Label.prototype.afterRender.createSequence(function() {
this.relayEvents(this.el, ['click']);
});//这一段一定要放在label之前
function change(){
alert("ff");
}

var formSet = new Ext.form.FieldSet({
title : '查询条件',layout : 'form',autoHeight : true,border: true,frame: true,
items : [{
layout:'form',
items:[{
layout:'column',
layoutConfig:{column:3},
defaults:{width:190},
items:[
{labelWidth : 20,layout : 'form',items : [{xtype : 'label',text : ''}],width:40},
{labelWidth : 20,layout : 'form',style: 'font-size:14;padding:3px 0 0 0;',
items : [{xtype : 'label',text : '年-月/周',
listeners : {'click' : { fn : function(field) {change();},scope : this } }
}],width:60}

]
}]
}]
});