javascript - jQuery-AJAX : Checking if Data Exists, 如果不是 "POST"

Question

我正在尝试检查“GET”返回的 JSON 数组对象中是否已存在数据。如果数据已经存在，我希望它忽略该数据。如果它不存在，我希望它“发布”。请帮忙。它似乎正在跳过“POST”调用。

  function POST(section){
     $.ajax({
        type: 'POST',
        dataType: 'json',
     async : false,
        data: JSON.stringify(section),
        url: '/api/v2/help_center/en-us/categories/200384077/sections.json',
        contentType: "application/json; charset=utf-8",

        headers: {
            "Authorization": "Basic " + btoa(username + ":" + password)
        },// end headers
        success: function (newSection) {
            console.log("Congrats! We have inserted a new section", newSection);

        },
        error: function (xhr, errorText) {
            console.log('Error ' + xhr.responseText);
        }
    })// end AJAX POST
    }

function addNewSection(name, description) {

    var section = { "section": { "position": 2, "name": name, "description": description, "content.translations.name": [{ "locale": "en-us" }] } };

    $.ajax({
        type: 'GET',
        url: '/api/v2/help_center/categories/200384077/sections.json',
        dataType: 'json',
        async : false,
        headers: {
            "Authorization": "Basic" + btoa(username + ":" + password)
        },
        success: function (mySections) {

            var naming = mySections.sections;
            $.each(naming, function (i, result) {
              if( $.inArray(name, result) == -1)
              {
                console.log("This already exists", name);
              } 

                if( !$.inArray(name, result) == -1) {
              POST(section);
              }

            });

        } // end success function
    })// end AJAX GET


}

Answer 1

从中删除 !:

if( !$.inArray(name, result) == -1)

所以你有:

if ($.inArray(name, result) == -1)

你写的基本上是双重否定。当没有找到任何内容时，$.inArray 返回-1。您永远不会将 ! 与 $.inArray 一起使用，因为它永远不会返回 false。