Uncaught TypeError: Cannot read properties of undefined (reading 'Hobbies')

Question

我运行陷入一个有趣的问题，这个问题让我陷入困境。我正在做一个 Sharepoint RestAPI 调用，returns 数据正确，当我运行对数据进行 for 循环时，它构建了 html 但仍然抛出我用作标题的错误.代码如下。如果我控制台记录每个循环，它将 return 该值。 HTML 也可以正常工作。问题是错误仍然出现。

function getSlideData() {
    var query = "$expand=AttachmentFiles&$select=Title,Team,State,Location,Hobbies,Favorite,Askme,GreatPlace,imageFact,ImageText,Attachments,AttachmentFiles&$expand=AttachmentFiles&$top=1000&$orderby=Created desc&$filter=Display eq 'Active'";
    var svcUrl = SITE_URL + "_api/web/lists/getbytitle('"+LIST_NAME+"')/items?"+query;
    var employeeData;

    $.ajax({
        url: svcUrl,
        type: "GET",
        headers: { "Accept": "application/json; odata=verbose" },
        async: false,
        success: function (data) {
            employeeData = data.d.results;
        },
        error: function (xhr) {
            alert("Can't get list items.", xhr.status + ": " + xhr.statusText); 
        }
    });

    return employeeData;
}

function buildSlides() {
    var slideData = getSlideData();
    var sliderWrapper = $('#slider-wrapper');
    var sliderWrapperContent = "";

    for(i=0;i<=slideData.length;i++) {
        sliderWrapperContent += '<div><h2>'+slideData[i].Hobbies+'</h2></div>';
        sliderWrapper.html(sliderWrapperContent);
    }
}

Answer 1

错误是你试图访问数组中不存在的索引，因为for循环中的<=，当你使用数组的.length时尝试使用<。

Uncaught TypeError: Cannot read properties of undefined (reading 'Hobbies')

Uncaught TypeError: Cannot read properties of undefined (reading 'Hobbies')

javascript

sharepoint

for-loop