// 通过接口(interface) 声明对象类型interfaceInfoType{readonlyname:string// 只读属性age?:number// 可选属性height:number}// 指定对象的类型constinfo:InfoType= {name:'zhangsan',age:20,height:170}console.log(info.name);// info.name = 'lisi'; // 只读属性不能修改info.age=22;// 可以修改 如上...
}typeStringOrNumberFunc=(ns:string|number) =>void;letfunc:StringOrNumberFunc= fn;// 不能将类型“(x: string) => void”分配给类型“StringOrNumberFunc”。// 参数“x”和“ns” 的类型不兼容。// 不能将类型“string | number”分配给类型“string”。// 不能将类型“string | number”分配给类...
Private fields start with a#character. Sometimes we call theseprivate names. Every private field name is uniquely scoped to its containing class. TypeScript accessibility modifiers likepublicorprivatecan’t be used on private fields. Private fields can’t be accessed or even detected outside of th...
To check if a string contains a substring in TypeScript, use the includes() method: const text = "TypeScript is awesome"; console.log(text.includes("awesome")); // true console.log(text.includes("Java")); // false This method is case-sensitive. For case-insensitive checks: console.lo...
For example, imagine an API where it’s common to misspell a property name by adding an extra s character at the end. Copy interface Options { /** File patterns to be excluded. */ exclude?: string[]; /** * It handles any extra properties that we haven't declared as type 'any'....
Private fields start with a#character. Sometimes we call theseprivate names. Every private field name is uniquely scoped to its containing class. TypeScript accessibility modifiers likepublicorprivatecan’t be used on private fields. Private fields can’t be accessed or even detected outside of th...
Although TypeScript can support bothstringandnumber, the return type of the numeric index must be a subtype of the return type of the character index. This is because when a number is used for indexing, JavaScript actually turns it into a string. This means that indexing with the number 100...
{command:`_typescript.goToSourceDefinition`arguments:[lsp.DocumentUri,// String URI of the documentlsp.Position,// Line and character position (zero-based)]} Response: lsp.Location[]|null (This command is supported from Typescript 4.7.) ...
(deptName:string="dept",empName:string="emp"):Promise<void> {constdept=simpleSqlName(deptName);constemp=simpleSqlName(empName);awaitsession.execute(`create table if not exists${dept}(deptno number(2, 0) not null constraint${dept}_pk primary key,dname varchar2(14 char) not null,loc ...
typeEnvConfig={COZE_API_KEY:string;COZE_BOT_ID:string;COZE_SPACE_ID:string;COZE_WORKFLOW_ID:string;COZE_BASE_URL:string;};functiongetEnvVar(name:keyofEnvConfig,configValue:string):string{constvalue=process.env[name]||configValue;if(!value){thrownewError(`Missing required environment variable:${...