js中Uncaught ReferenceError: string is not defined

在JavaScript中，当你尝试使用未定义的变量时，就会出现“Uncaught ReferenceError: string is not defined”这样的错误。这通常是由于以下原因之一引起的：

1. 拼写错误：变量名拼写错误或未定义。
2. 变量作用域：变量在当前作用域中未定义。
3. 变量未声明：变量未声明或未初始化。

以下是一些可能导致此错误的示例代码：

// 示例1：拼写错误
var str = "Hello World";
console.log(st); // 错误：Uncaught ReferenceError: st is not defined

// 示例2：变量作用域
function test() {
  var a = "Hello";
}
console.log(a); // 错误：Uncaught ReferenceError: a is not defined

// 示例3：变量未声明
console.log(b); // 错误：Uncaught ReferenceError: b is not defined

相关问题

Uncaught ReferenceError: _typeof is not defined

This error occurs when you try to use the _typeof function in your code, but the function is not defined. The _typeof function is used to determine the type of a variable in JavaScript.

To fix this error, make sure that you have included the definition of the _typeof function in your code. You can define the function yourself or use a library that provides the function.

Here is an example of how to define the _typeof function:

function _typeof(obj) {
return typeof obj;
}

Alternatively, you can use the typeof operator directly instead of using the _typeof function, for example:

if (typeof myVariable === 'string') {
// do something
}

dwxx.vue:1372 Uncaught (in promise) ReferenceError: deviceTerm is not defined

根据提供的引用内容，可以看出这是一个关于编程错误的问题。错误信息"TypeError: __str__ returned non-string (type NoneType)"表明在某个对象的__str__方法返回了一个非字符串类型的值，这可能是因为该方法没有正确地实现或者返回了None值。

另外两个错误信息"Type interface com.dao.handle.oaMapper is not known to the MapperRegistry"和"dwxx.vue:1372 Uncaught (in promise) ReferenceError: deviceTerm is not defined"，则是与Java/Mybatis相关的错误。第一个错误信息表明在MapperRegistry中找不到com.dao.handle.oaMapper接口的定义，可能是因为该接口没有正确注册到MapperRegistry中。而第二个错误信息则是在JavaScript代码中出现了对未定义变量deviceTerm的引用。

根据以上分析，这些错误主要是由于代码中的错误或者逻辑问题造成的。可以尝试检查相应对象的__str__方法的实现，确保返回的是字符串类型的值。另外，也需要确认com.dao.handle.oaMapper接口已经正确注册到MapperRegistry中，并检查JavaScript代码中是否正确定义了deviceTerm变量。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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