Question

问题：当通过AJAX向MongoDB发送数据时，子目标名称[0] [x]变为单个字符串：“points [0] [x]”。如何防止密钥成为单个字符串？

我使用Ajax这样的帖子在MongoDB中添加了一个对象：

if(errorCount === 0) {
    var newDesign = {
        filename: 'designs/documents-desktop.jpg',
        title: 'Tester',
        slug: 'tester',
        pos: '1',
        points: [
            {
                x: '0.40',
                y: '0.211',
                title: 'test',
                content: 'Blank for now'
            },
            {
                x: '0.295',
                y: '0.090',
                title: 'Another Test',
                content: 'Blank for now again'
            }
        ]
    }

    $.ajax({
        type: "POST",
        data: newDesign,
        url: "/data/add-design",
        dataType: 'JSON',
    }).done(function(response) {
        if(response.msg === '') {

        } else {
            alert("ERROR: " + response.msg);
        }
    });
}

然后我使用getJSON来获取它，并使用console.log输出this.points [0] [x]：

$.getJSON('/data', function(data) {
    $.each(data, function() {
        console.log(this.points[0][x])
    });
});

但它没有用，我收到了这个错误：

 Uncaught TypeError: Cannot read property '0' of undefined

您可以看到当console.log整个对象时，所有数据都存在，但每个子数组键都是一个字符串：

{"_id":"54bcb74584a4c8bd05e3d772","filename":"designs/documents-desktop.jpg","title":"Tester","slug":"tester","pos":"1","points[0][x]":"0.40","points[0][y]":"0.211","points[0][title]":"test","points[0][content]":"Blank for now","points[1][x]":"0.295","points[1][y]":"0.090","points[1][title]":"Another Test","points[1][content]":"Blank for now again"}

您还可以在mongo终端中看到点[0] [x]正在变为单个字符串：

 db.filelist.find().pretty();
{
    "_id" : ObjectId("54bcc85384a4c8bd05e3d777"),
    "filename" : "designs/documents-desktop.jpg",
    "title" : "Tester",
    "slug" : "tester",
    "pos" : "1",
    "points[0][x]" : "0.40",
    "points[0][y]" : "0.211",
    "points[0][title]" : "test",
    "points[0][content]" : "Blank for now",
    "points[1][x]" : "0.295",
    "points[1][y]" : "0.090",
    "points[1][title]" : "Another Test",
    "points[1][content]" : "Blank for now again"
}

这里有什么我想念的吗？我似乎在NodeJS和Express的服务器端没有任何错误。可能是什么问题？

Answer 1

感谢@adeneo和@NeilLunn，我们解决了这个问题。 AJAX请求将contentType指定为＆＃34; json＆＃34;，当它真正需要的是＆＃34; application / json;字符集= UTF-8＆＃34 ;.现在，子数组密钥正在MongoDB中正确包含：

$.ajax({
        type: "POST",
        data: JSON.stringify(newDesign),
        url: "/data/add-design",
        contentType: 'application/json; charset=utf-8',
    }).done(function(response) {
        if(response.msg === '') {

        } else {
            alert("ERROR: " + response.msg);
        }
    });

NodeJS MongoDB Express 4 getJSON子阵列密钥被转换为字符串

1 个答案: