private 和 protected。 public: 默认的修饰符,它表示属性或方法是公有的,可以在类的内部和外部被访问。 private: 表示属性或方法是私有的,只能在类的内部被访问,外部无法访问。 protected: 表示属性或方法是受保护的,只能在类的内部及其子类中被访问,外部无法访问。 1.private 修饰符 示例: classPerson{privatenam...
{"compilerOptions":{"target":"es2016",// 编译生成的目标版本代码// "lib": ["esnext","dom","dom.iterable","scripthost"], // 指定我们需要用到的库,也可以不配置,直接根据 target 来获取 /* Specify a set of bundled library declaration files that describe the target runtime environment. */...
These imports are often calledside effect importsbecause the only useful behavior they can provide is by executing some side effect (like registering a global variable, or adding a polyfill to a prototype). In TypeScript, this syntax has had a pretty strange quirk: if theimportcould be resolve...
1091 错误 Only a single variable declaration is allowed in a 'for...in' statement. "for...in" 语句中只允许单个变量声明。1092 错误 Type parameters cannot appear on a constructor declaration. 类型参数不能出现在构造函数声明中。1093 错误 Type annotation cannot appear on a constructor declaration....
VSCode(全称:Visual Studio Code)是一款由微软开发且跨平台的现代化轻量化免费开源代码编辑器。 VSCode支持语法高亮、代码自动补全(又称 IntelliSense)、代码重构、查看定义功能,并且内置了命令行工具和 Git 版本控制系统。 用户可以更改主题和键盘快捷方式实现个性化设置,也可以通过内置的扩展程序商店安装扩展以拓展软件功...
Let's start with the example below, where you want to log the value of the variable passed as a parameter.ExampleIn the code below, we have defined the printVar() function which takes the number value as a parameter and logs the value in the console. Next, we invoke the function by ...
console.log(name); // Error: [ts] Variable 'address' is used before being assigned. 对于可能是undefined的变量: 使用显式声明 提示编译错误:当使用一个可能为null的变量的时候。 使用前,需要确定不是undefined. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 var address: string | undefined; /...
Namespaces had a few useful features. For example, their scopes could merge across files, meaning it was easy to break up a project across files and expose it cleanly as a single variable. Copy // parser.tsnamespacets { exportfunctioncreateSourceFile(/*...*/){/*...*/} ...
1123 错误 Variable declaration list cannot be empty. 变量声明列表不能为空。 1124 错误 Digit expected. 应为数字。 1125 错误 Hexadecimal digit expected. 应为十六进制数字。 1126 错误 Unexpected end of text. 文本意外结束。 1127 错误 Invalid character. 无效的字符。
error(getNameOfDeclaration(source.declarations[0]), Diagnostics.Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity, symbolToString(target)); } else { const message = target.flags & SymbolFlags.BlockScopedVariable || source.flags & SymbolFlags.BlockScopedVariable...