Sharepoint Guidfield - 如何在前端显示它并在代码中设置它的值？

// 显示 Guidfield 的值
var fieldGuid = context.get_web().get_lists().getByTitle('ListName').get_fields().getByInternalNameOrTitle('FieldName');
context.load(fieldGuid);
context.executeQueryAsync(function() {
    var guidValue = fieldGuid.get_value();
    // 将 guidValue 显示在相应的控件中
    document.getElementById('guidField').value = guidValue;
}, function(sender, args) {
    console.log(args.get_message());
});

// 设置 Guidfield 的值
var listItem = context.get_web().get_lists().getByTitle('ListName').getItemById(itemId);
listItem.set_item('FieldName', new SP.FieldGuidValue(guidValue));
listItem.update();
context.executeQueryAsync(function() {
    console.log('Guidfield 的值已成功设置');
}, function(sender, args) {
    console.log(args.get_message());
});