globalThis
时间: 2023-09-28 08:06:37 浏览: 103
globalThis 是一个标准的方式来获取不同环境下的全局 this 对象,它可以在有无窗口的各种环境下正常工作。不同于 window 或者 self 这些属性,globalThis 确保了在任何运行环境下都能正常使用。简单来说,全局作用域中的 this 就是 globalThis。在以前,如果想要获取全局对象,需要通过一个全局函数来实现,但现在可以直接使用 globalThis 来获取全局对象。
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globalthis
globalThis是一个标准的方式来获取不同环境下的全局this对象。它可以在有无窗口的各种环境下正常工作,并提供了一种统一的方法来获取全局对象。在全局作用域中,globalThis就是this对象的全局引用。全局属性globalThis包含了全局的this值,类似于全局对象。通过globalThis可以方便地访问全局对象的属性和方法。以前,想要获取全局对象需要通过一个全局函数来实现。这个函数根据不同的环境来返回相应的全局对象,如self、window或global。但现在有了globalThis,我们不再需要担心不同环境下的兼容性问题,可以直接使用globalThis来获取全局对象。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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globalThis is not defined
`globalThis` is a global object that provides a unified way to access the global scope in different environments (i.e. browser window, Node.js, Web Workers, etc.). However, it is not supported in older browsers and some environments, so you may encounter the "globalThis is not defined" error.
To avoid this error, you can use a polyfill or a fallback approach to access the global object based on the environment you are in. For example, in a browser environment, you can use `window` instead of `globalThis`. In a Node.js environment, you can use `global` instead.
Here's an example of how you can use a fallback approach to access the global object:
```
var globalObj = typeof globalThis !== 'undefined' ? globalThis :
typeof window !== 'undefined' ? window :
typeof global !== 'undefined' ? global :
typeof self !== 'undefined' ? self : {};
```
This code checks for the existence of `globalThis`, `window`, `global`, and `self` objects and assigns the first one that exists to the `globalObj` variable. This way, you can access the global object without encountering the "globalThis is not defined" error.