Javascript XrmServiceToolkit.Rest.Retrieve

    //＜パターン1＞ 個別項目取得
	var lookupFieldValue = Xrm.Page.getAttribute("new_lookupName").getValue(); //画面からLookup項目値取得
	XrmServiceToolkit.Rest.Retrieve(
	    lookupFieldValue[0].id, "dsh_entityNameSet",
	    "new_field1","new_field2","new_field3",
	    null, function (result) { entityName = result }, XrmServiceToolkit.Common.ShowError, false);
	    
		var field1 = entityName.new_field1 != null ? entityName.new_field1.Value : null;
		var field2 = entityName.new_field2 != null ? entityName.new_field2 : null;
		var field3 = entityName.new_field3 != null ? entityName.new_field3 : null;
    
    
    //＜パターン２＞ 全量データ取得
	if (entityGuid != "") {
		//オブジェクト取得
		XrmServiceToolkit.Rest.Retrieve(entityGuid, "dsh_entityNameSet", null, null, function (result) { entityName = result; }, XrmServiceToolkit.Common.ShowError, false);

		//定期成約
		if (!IsNull(entityName.new_optionSetfield1)) {
		    var optionValue = entityName.new_optionSetfield1;
		    var varible1 = optionValue.Value;
		}
		if (!IsNull(entityName.new_TypeFiled1)) {
		    var varible2 = entityName.new_TypeFiled1.Value;
		}
	}