在javascript中等效的字典/ hashmap [英] Dictionary/hashmap equivalent in javascript

问题描述

嗨


我创建了几个

 google.maps.Marker 

个实例，每个实例都有一个ID。



在VB.NET中我会创建一个Dictionary（Of String，Object）并使用myDict（id）查找标记 - JavaScript中的等价物是什么？我还需要能够通过id删除id-marker对。



谢谢



我尝试过：



添加并查找：

 var markers = {}; 
 
 markers [markers.length] = {id，new google.maps.Marker（...）}; 
 
 var marker = markers [id]; 

删除：

 var i;找到
 
：
 for（i = 0; i< markers.length; i ++）
 {
 if（markers [i] = id）//将绝对没有用
 {
 markers.splice（i，1）;发现
休息; 
} 
} 

解决方案

您已经关闭：

 var markers = {}; 
 
 //添加或更新：
 markers [id] = new google.maps.Marker（...）; 
 
 //要检索：
 var marker = markers [id]; 
 
 //测试密钥是否存在：
 var exists = markers.hasOwnProperty（id）; 
 
 //删除：
删除标记[id]; 

使用对象 - JavaScript | MDN [ ^ ]

Object.prototype.hasOwnProperty（） - JavaScript | MDN [ ^ ]

删除运算符 - JavaScript | MDN [ ^ ]

Hi
I am creating several

google.maps.Marker

instances and each have an id.

In VB.NET I would create a Dictionary(Of String, Object) and look up the marker with myDict(id) - what's the equivalent in JavaScript? I will also need to be able to delete id-marker pairs by the id.

Thanks

What I have tried:

To add and look up:

var markers = {};

markers[markers.length] = {id, new google.maps.Marker(...)};

var marker = markers[id];

To remove:

var i;

found:
for(i = 0; i < markers.length; i++)
{
    if(markers[i] = id) // will definitely not work
    {
        markers.splice(i, 1);
        break found;
    }
}

解决方案

You're close:

var markers = {};

// To add or update:
markers[id] = new google.maps.Marker(...);

// To retrieve:
var marker = markers[id];

// To test whether the key exists:
var exists = markers.hasOwnProperty(id);

// To remove:
delete markers[id];

Working with objects - JavaScript | MDN[^]
Object.prototype.hasOwnProperty() - JavaScript | MDN[^]
delete operator - JavaScript | MDN[^]

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