如何在javascript中更新和删除对象值

Posted 2023-02-22

【中文标题】如何在javascript中更新和删除对象值

【英文标题】：How to update and delete object Value in javascript

【发布时间】：2016-03-05 02:42:58

【问题描述】：

var key = "kay_1": "sample_1":"spmedata", "sample_2":"spmedata", , “凯_2”： "sample_1":"spmedata", "sample_2":"spmedata",

现在我的问题是如何更新和删除“kay_2”->“sample_1”键？

【问题讨论】：

使用点或括号表示法更新值：key['kay_2']['sample_1'] = 'new value'。要删除使用delete key['kay_2']['sample_1']。

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请看一下：developer.mozilla.org/en-US/docs/Web/javascript/Guide/…

需要一个完整的教程来通过 Native Javascript 操作 JSON 数据。

【参考方案1】：

var key="kay_1":        
             "sample_1":"spmedata",
             "sample_2":"spmedata",
    ,
"kay_2":        
             "sample_1":"spmedata",
             "sample_2":"spmedata",
    


// To update the value
key['kay_2']['sample_1'] = 'new value';

// To delete the key
delete key['kay_2']['sample_1']

【讨论】：

1：对象纬度：对象纬度：37.579412513438385 lng：-99.4976806640625 proto：对象 proto：对象 2：对象纬度：对象纬度：37.996162679728116 lng: -90.7745361328125 proto: Object proto: Object proto: Object 如何动态更新对象'2' latlng？代码会检查它是对象 1 还是对象 2？我有整数值，我已经检查过了，但它成为整数检查的对象？

【参考方案2】：

两种方式都可以更新

key.kay_2.sample_1 = "changed value";
key['kay_2']['sample_1'] = "changed value";

for delete is the same

delete key.kay_2.sample_1;
delete key['kay_2']['sample_1'];

【参考方案3】：

要修改值试试，

key.kay_2.sample_1 = "changed value";

删除，

delete key.kay_2.sample_1