主要用例子说明extjs4的form表单的运用，其中有表单属性说明，表单控件运用说明如： title:'表单', //表单标题 bodyStyle:'padding:5 5 5 5', //表单边距 height:120, //表单高度 width:200, //表单宽度 frame:true, //是否渲染表单 renderTo :'form', //表单渲染的地方 defaultType: 'numberfield', //设置表单字段的默认类型 defaults:{ //统一设置表单字段

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