您可以使用find()方法而不是filter()来查找JSON数组中“nome”属性具有特定值的对象。下面是一个例子：

const jsonArray = [
    // Your JSON array here...
];

const searchTerm = "fullcalendar";
const foundObject = jsonArray.find(obj => obj.nome === searchTerm);

if (foundObject) {
    const url = foundObject.url;
    console.log(url); // "fullcalendar.php"
} else {
    console.log("Object not found in the array.");
}

在本例中，find()方法用于搜索jsonArray中具有与searchTerm相同的“nome”属性的第一个对象。如果找到匹配的对象，则返回其“url”属性的值。否则，将记录一条指示未找到对象的消息。
在这种情况下，使用find()比filter（）更有效，因为它在找到第一个匹配对象时立即停止搜索，而不是迭代整个数组。

使用.find方法返回包含fullcalendar值的对象，然后仅打印url属性

const arr = [
    {"id":1,"nome":"smartform","url":"smartform.php","label":"Dashboard","icon":"fas fa-th-large","data_attribute":"","parent":"Smartform"},
    {"id":2,"nome":"form_wizard","url":"form_wizard.php","label":"Crea uno Smartform","icon":"fas fa-plus","data_attribute":"data-action=\"create\" data-step=\"0\" data-token=\"0\"","parent":"Smartform"},
    {"id":3,"nome":"fullcalendar","url":"fullcalendar.php","label":"Calendario","icon":"far fa-calendar","data_attribute":"","parent":"Tools"},
    {"id":4,"nome":"gantt","url":"gantt.php","label":"Gantt","icon":"fas fa-stream","data_attribute":"","parent":"Tools"},
    {"id":5,"nome":"timesheet","url":"timesheet.php","label":"Timesheet","icon":"fas fa-hourglass","data_attribute":"","parent":"Tools"},
    {"id":6,"nome":"kanban","url":"kanban.php","label":"Kanban","icon":"fas fa-list-ul","data_attribute":"","parent":"Tools"},
    {"id":7,"nome":"openpoints","url":"items.php?tipo=openpoints","label":"Open Points","icon":"fas fa-keyboard","data_attribute":"","parent":"Risk Management"},
    {"id":8,"nome":"risks","url":"items.php?tipo=risks","label":"Rischi","icon":"fas fa-exclamation","data_attribute":"","parent":"Risk Management"},
    {"id":9,"nome":"issues","url":"items.php?tipo=issues","label":"Issue","icon":"fas fa-fire","data_attribute":"","parent":"Risk Management"},
    {"id":10,"nome":"changerequests","url":"items.php?tipo=changerequests","label":"Change Requests","icon":"fas fa-plus","data_attribute":"","parent":"Risk Management"}
];

const result = arr.find(x => x.nome == "fullcalendar")
console.log(result.url)

你需要使用Array.prototype.find：

const items = [
    {"id":1,"nome":"smartform","url":"smartform.php","label":"Dashboard","icon":"fas fa-th-large","data_attribute":"","parent":"Smartform"},
    {"id":2,"nome":"form_wizard","url":"form_wizard.php","label":"Crea uno Smartform","icon":"fas fa-plus","data_attribute":"data-action=\"create\" data-step=\"0\" data-token=\"0\"","parent":"Smartform"},
    {"id":3,"nome":"fullcalendar","url":"fullcalendar.php","label":"Calendario","icon":"far fa-calendar","data_attribute":"","parent":"Tools"},
    {"id":4,"nome":"gantt","url":"gantt.php","label":"Gantt","icon":"fas fa-stream","data_attribute":"","parent":"Tools"},
    {"id":5,"nome":"timesheet","url":"timesheet.php","label":"Timesheet","icon":"fas fa-hourglass","data_attribute":"","parent":"Tools"},
    {"id":6,"nome":"kanban","url":"kanban.php","label":"Kanban","icon":"fas fa-list-ul","data_attribute":"","parent":"Tools"},
    {"id":7,"nome":"openpoints","url":"items.php?tipo=openpoints","label":"Open Points","icon":"fas fa-keyboard","data_attribute":"","parent":"Risk Management"},
    {"id":8,"nome":"risks","url":"items.php?tipo=risks","label":"Rischi","icon":"fas fa-exclamation","data_attribute":"","parent":"Risk Management"},
    {"id":9,"nome":"issues","url":"items.php?tipo=issues","label":"Issue","icon":"fas fa-fire","data_attribute":"","parent":"Risk Management"},
    {"id":10,"nome":"changerequests","url":"items.php?tipo=changerequests","label":"Change Requests","icon":"fas fa-plus","data_attribute":"","parent":"Risk Management"}
];

function getUrl(nome) {
  return items.find(item => item.nome === nome)?.url;
}

// more flexible option
function getProperty(searchKey, searchValue, returnKey) {
  const item = items.find(item => item[searchKey] === searchValue);
  return item ? item[returnKey] : item;
}

console.log(getUrl('fullcalendar'));
console.log(getProperty('nome', 'fullcalendar', 'url'));

虽然可以使用find（或filter）访问单个项，但每次都需要迭代数组。这听起来像是你想通过字符串键来任意访问一个项目，它本质上是一个map/dict。在这种情况下，我建议从一个项目数组转换为由'nome'值键控的相同项目的Map。然后你可以直接访问它，而且更有效，因为对密钥的随机访问是恒定时间的。假设您在页面/应用程序的整个生命周期中的不同时间访问不同的值，这将更好地工作。

const items = [{
    "id": 1,
    "nome": "smartform",
    "url": "smartform.php",
    "label": "Dashboard",
    "icon": "fas fa-th-large",
    "data_attribute": "",
    "parent": "Smartform"
  },
  {
    "id": 2,
    "nome": "form_wizard",
    "url": "form_wizard.php",
    "label": "Crea uno Smartform",
    "icon": "fas fa-plus",
    "data_attribute": "data-action=\"create\" data-step=\"0\" data-token=\"0\"",
    "parent": "Smartform"
  },
  {
    "id": 3,
    "nome": "fullcalendar",
    "url": "fullcalendar.php",
    "label": "Calendario",
    "icon": "far fa-calendar",
    "data_attribute": "",
    "parent": "Tools"
  },
  {
    "id": 4,
    "nome": "gantt",
    "url": "gantt.php",
    "label": "Gantt",
    "icon": "fas fa-stream",
    "data_attribute": "",
    "parent": "Tools"
  },
  {
    "id": 5,
    "nome": "timesheet",
    "url": "timesheet.php",
    "label": "Timesheet",
    "icon": "fas fa-hourglass",
    "data_attribute": "",
    "parent": "Tools"
  },
  {
    "id": 6,
    "nome": "kanban",
    "url": "kanban.php",
    "label": "Kanban",
    "icon": "fas fa-list-ul",
    "data_attribute": "",
    "parent": "Tools"
  },
  {
    "id": 7,
    "nome": "openpoints",
    "url": "items.php?tipo=openpoints",
    "label": "Open Points",
    "icon": "fas fa-keyboard",
    "data_attribute": "",
    "parent": "Risk Management"
  },
  {
    "id": 8,
    "nome": "risks",
    "url": "items.php?tipo=risks",
    "label": "Rischi",
    "icon": "fas fa-exclamation",
    "data_attribute": "",
    "parent": "Risk Management"
  },
  {
    "id": 9,
    "nome": "issues",
    "url": "items.php?tipo=issues",
    "label": "Issue",
    "icon": "fas fa-fire",
    "data_attribute": "",
    "parent": "Risk Management"
  },
  {
    "id": 10,
    "nome": "changerequests",
    "url": "items.php?tipo=changerequests",
    "label": "Change Requests",
    "icon": "fas fa-plus",
    "data_attribute": "",
    "parent": "Risk Management"
  }
]

const itemsMap = items.reduce((acc, item) => {
  // add it to the map if it has a nome
  if (item.hasOwnProperty('nome')) {
    acc[item.nome] = item;
  }
  return acc;
}, {})

console.log(itemsMap.fullcalendar ? .url)

https://playcode.io/1482928

[
    {"id":1,"nome":"smartform","url":"smartform.php","label":"Dashboard","icon":"fas fa-th-large","data_attribute":"","parent":"Smartform"},
    {"id":2,"nome":"form_wizard","url":"form_wizard.php","label":"Crea uno Smartform","icon":"fas fa-plus","data_attribute":"data-action=\"create\" data-step=\"0\" data-token=\"0\"","parent":"Smartform"},
    {"id":3,"nome":"fullcalendar","url":"fullcalendar.php","label":"Calendario","icon":"far fa-calendar","data_attribute":"","parent":"Tools"},
    {"id":4,"nome":"gantt","url":"gantt.php","label":"Gantt","icon":"fas fa-stream","data_attribute":"","parent":"Tools"},
    {"id":5,"nome":"timesheet","url":"timesheet.php","label":"Timesheet","icon":"fas fa-hourglass","data_attribute":"","parent":"Tools"},
    {"id":6,"nome":"kanban","url":"kanban.php","label":"Kanban","icon":"fas fa-list-ul","data_attribute":"","parent":"Tools"},
    {"id":7,"nome":"openpoints","url":"items.php?tipo=openpoints","label":"Open Points","icon":"fas fa-keyboard","data_attribute":"","parent":"Risk Management"},
    {"id":8,"nome":"risks","url":"items.php?tipo=risks","label":"Rischi","icon":"fas fa-exclamation","data_attribute":"","parent":"Risk Management"},
    {"id":9,"nome":"issues","url":"items.php?tipo=issues","label":"Issue","icon":"fas fa-fire","data_attribute":"","parent":"Risk Management"},
    {"id":10,"nome":"changerequests","url":"items.php?tipo=changerequests","label":"Change Requests","icon":"fas fa-plus","data_attribute":"","parent":"Risk Management"}
].filter(ele => ele.nome === "fullcalendar")[0].url

1. filter你可以得到符合你在filter（）函数中提供的选项的元素。你可以在这个文档中得到更多。https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
2. [0]如果你想从中得到一个元素，你应该通过索引切片得到第一个元素。但是你需要处理过滤数组的长度为0的情况。则[0]可能未定义。
3. .url您可以通过.访问属性。