请问为什么打开的dialog默认会有form层呢？

jQuery('#'+options.elementID).iDialog('openDialog', {
			id: 'b',
			title : options.title || '对话框',
			width : '700',
			height : '500',
			minimizable : false,
			maximizable : true,
			closed: false,
	        cache: false,
			modal : true,
			closable : true,
			href: options.uri,
			onOpen: function() {
				jQuery('.dialog-button').find('.l-btn-icon-left').addClass('dialogBtn');
				jQuery('#'+options.formID).form('reset');
			},
			onBeforeClose : function (){
				jQuery('#'+options.formID).form('reset');
			},
			buttons : [ {
				text : options.submitText || '提交',
				iconCls: 'fa fa-check-circle-o',
	            btnCls: 'topjui-btn-blue',
				handler : function (){
					if (submitHandler !=null){
						submitHandler();
					}else {
						$.send(options.url, options.formID, options.tableID);
					}
					jQuery('#b').iDialog('close').form('reset')
				}
			}, {
				text : options.cancelText || '取消',
				iconCls: 'fa fa-times',
	        	btnCls: 'topjui-btn-black',
				handler : function (){
					if (cancelHandler !=null){
						cancelHandler()
					}else {
						jQuery('#b').iDialog('close').form('reset')
					}
				}
			} ]
		});

jQuery('#'+options.elementID).iDialog({
			title : options.title || '对话框',
			width : '700',
			height : '500',
			minimizable : false,
			maximizable : true,
			closed: false,
	        cache: false,
			modal : true,
			closable : true,
			href: options.uri,
			onOpen: function() {
				jQuery('.dialog-button').find('.l-btn-icon-left').addClass('dialogBtn');
				jQuery('#'+options.formID).form('reset');
			},
			onBeforeClose : function (){
				jQuery('#'+options.formID).form('reset');
			},
			buttons : [ {
				text : options.submitText || '提交',
				iconCls: 'fa fa-check-circle-o',
	            btnCls: 'topjui-btn-blue',
				handler : function (){
					if (submitHandler !=null){
						submitHandler();
					}else {
						$.send(options.url, options.formID, options.tableID);
					}
					jQuery('#'+options.elementID).iDialog('close')
				}
			}, {
				text : options.cancelText || '取消',
				iconCls: 'fa fa-times',
	        	btnCls: 'topjui-btn-black',
				handler : function (){
					if (cancelHandler !=null){
						cancelHandler()
					}else {
						jQuery('#'+options.elementID).iDialog('close')
					}
				}
			} ]
		});