typescript 无法在打字稿中提取对象值
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Unable to extract object values in Typescript
提问by David Carrick Sutherland
I have been trying to convert a JavaScript web form to Typescript, and have been unable to work out how to deal with the following (which works in JavaScript):
我一直在尝试将 JavaScript 网络表单转换为 Typescript，但一直无法解决以下问题（在 JavaScript 中有效）：
let fieldValues = JSON.parse(cookieData);
let keys = Object.keys(fieldValues);
let values = Object.values(fieldValues);
Visual Studio tells me:
Visual Studio 告诉我：
Error TS2339 Property 'values' does not exist on type 'ObjectConstructor'.
错误 TS2339 类型“ObjectConstructor”上不存在属性“values”。
What can I do?
我能做什么？
回答by Diullei
The Object.values(..)is not stabilized, so it is unsupported in many browsers (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values)
在Object.values(..)没有稳定，所以它不支持在许多浏览器（https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values）
Use mapinstead:
使用map来代替：
let values = Object.keys(fieldValues).map(key => fieldValues[key]);
If you really want to use this function you need to add the
"es2017.object"lib on yourtsconfig.json. Make sure you are using a polyfill or if your final platform support this feature.
如果你真的想使用这个功能，你需要
"es2017.object"在你的tsconfig.json. 确保您使用的是 polyfill，或者您的最终平台是否支持此功能。
回答by gyre
If Object.valuesis not supported (which today is often the case), you can just mapover your keys:
如果Object.values不支持（今天经常是这种情况），你可以只map在你的keys：
let cookieData = '{"key":"value"}'
let fieldValues = JSON.parse(cookieData)
let keys = Object.keys(fieldValues)
let values = keys.map(k => fieldValues[k])
console.log(keys) //=> ['key']
console.log(values) //=> ['value']回答by Devashree
If you need the value of a specific key you can access it using the following method :
如果您需要特定键的值，您可以使用以下方法访问它：
Object(nameofobj)["nameofthekey"]
回答by stefku
Just as an alternative. You also could use Object.getOwnPropertyNames()
只是作为替代。你也可以使用Object.getOwnPropertyNames()
let obj = {...};
Object.getOwnPropertyNames(obj).forEach(key => {
let value = obj[key];
});
