ext从后台加载数据到下拉框
var formPanel = new Ext.form.FormPanel({id:'node_formPanel2',padding:10,margin:10,labelWidth:80,split : true,scripts : true,autoScroll : true,viewConfig : {forceFit : true},layout:'form',items:[{xtype:'textfield', id:'policyParaId_text_add2',name:'policyParaId',anchor:'97%',fieldLabel:'策略参数id',hidden:true},{xtype:'textfield', id:'policyDefineId_text_add2',name:'policyDefineId',anchor:'97%',fieldLabel:'策略参数id',hidden:true},collTaskParaIdCombo,
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