注意这种写法

function AddEditDevice(data){
	var form = $("#deviceEditform");
	if (form.length == 0) {
	   form = $("<form id='deviceEditform' action='/sites/device.aspx' method='get' target='_blank' style='display:none'></form>");
	   $("body").append(form);
	}
	form.empty();
	form.append(Elm("Action").val(data["action"]));
	if(data["id"]) form.append(Elm("deviceId").val(data["id"]));
	if(data["orgId"]!=undefined) form.append(Elm("orgId").val(data["orgId"]));
	if(data["type"]!=undefined) form.append(Elm("deviceClass").val(data["type"]));
	if(data["target"]!=undefined) form.attr("target",data["target"]);
	form.append(Elm("n").val(new Date().getTime()));
	form.submit();	
}