javascript - 创建javascript对象

Question

我有这个功能

// add history paths and save data
function AddPath( strTag, strUserName, arrayLatLngPoints, pathColour) {

  for (var i = 0; i < arrayLatLngPoints.length; i++)
    {
    var point = arrayLatLngPoints[i];
    var date = new Date( parseInt( point.timestamp));
    addMarkers(point.timestamp, point.lat, point.lng, point.timestamp, strUserName, pathColour, date.toString());
    date = null; 
    }
}

除了使用 addMarkers() 添加标记外，我还想将纬度、经度和时间戳存储在一个对象中。

我在想最好的存储方式应该是这样的

{ strUserName : { timestamp : point.timestamp , LatLng : point.LatLng }, strUserName : { timestamp : point.timestamp , LatLng : point.LatLng } }

或

{ strUserName : { timestamp : point.timestamp , LatLng : { lat : point.lat, lng : point.lng } }, ..

如何创建这个对象？

更新:

感谢您的回复。 我试过以下..

// add history paths and save data
function AddPath( strTag, strUserName, arrayLatLngPoints, pathColour) {

  for (var i = 0; i < arrayLatLngPoints.length; i++)
    {
    var point = arrayLatLngPoints[i];
    var pos = new google.maps.LatLng(point.lat, point.lng);

    var history = {
        strUserName : {
            timestamp : point.timestamp ,
            LatLng : pos
        }
    };

    var date = new Date( parseInt( point.timestamp));
    addMarkers(point.timestamp, point.lat, point.lng, point.timestamp, strUserName, pathColour, date.toString());
    date = null; 
    }
console.log(history);
}

查看控制台截图

用户名无效，我没有得到每个时间戳的项目，它只是覆盖了一个条目？

Answer 1

How can i create this object?

和你做的差不多:

var obj = { strUserName : { timestamp : point.timestamp , LatLng : point.LatLng }, strUserName : { timestamp : point.timestamp , LatLng : point.LatLng } };

或者更易读:

var obj = {
    strUserName : {
        timestamp : point.timestamp ,
        LatLng : point.LatLng
    },
    strUserName : {
        timestamp : point.timestamp ,
        LatLng : point.LatLng
    }
};

那是一个 object initializer .它创建一个具有给定属性的新对象(实际上是三个新对象)并返回对它们最外层的引用。

举一些简单的例子:

// Create a blank object (an object with no properties of its own):
var a = {};

// Create an object with a `name` property with the value "Fred"
var b = {name: "Fred"};

// Create an object with a `foo` property, which is *another* freshly-created
// object with a `name` property with the value "Barney"
var c = {
    foo: {
        name: "Barney"
    }
};

---

关于您更新的问题:

the username has not worked and im not getting an item for each timestamp, its just overwriting the one entry?

当然是这样，您将在每个循环中覆盖 history，而不会在任何地方存储较早的副本。例如，您可以将它们存储在一个数组中:

// add history paths and save data
function AddPath( strTag, strUserName, arrayLatLngPoints, pathColour) {

  var historyArray = [];
  for (var i = 0; i < arrayLatLngPoints.length; i++)
    {
    var point = arrayLatLngPoints[i];
    var pos = new google.maps.LatLng(point.lat, point.lng);

    historyArray[i] = {
        strUserName : {
            timestamp : point.timestamp ,
            LatLng : pos
        }
    };

    var date = new Date( parseInt( point.timestamp));
    addMarkers(point.timestamp, point.lat, point.lng, point.timestamp, strUserName, pathColour, date.toString());
    date = null; 
    }
console.log(historyArray);
}