function test(template, name, age) { console.log(template); console.log(name); console.log(age); } var myname = 'xiao ming'; var getage = function () { return 20; }; test(__makeTemplateObject(["hello my name is ", ", I am ", ""], ["hello my name is ", ", I am "...
T : never; interface MessageTemplateDefinition { [TKey: string]: MessageTemplateFunction; } type __ChannelSendParamsData< TMessageTemplateDefinition > = TMessageTemplateDefinition extends MessageTemplateDefinition ? Intersection< __MessageTemplateFunctionSourceData< TMessageTemplateDefinition[keyof TMessageTem...
interfaceA{readonlyname:string//这个readonly是只读属性,意思就是说只能读取,不能将其他值赋值给他age?:number//这个问号就是可选的意思,条件稍微宽松了一些,下面引用这个age的话有没有这个属性都可以,不会报错}letobj:A={name="叶秋学长嗷嗷叫"//这里如果不写name就会报错,因为我们在上面定义了A类型集合,并且...
此时就可以用 template string type 了，代码片段如下：type Json2jsonReturnType<U> = U extends stri...
declarefunctionmakeWatchedObject<Type>(obj:Type):Type& {on(eventName:string,callback:(newValue:any)=>void):void}; 第二步:定义一个类型工具,负责提取类型上的属性作为模板字符串的插值。大家不清楚 extends 、 keyof 用法的请看这篇文章 《TypeScript 玩转类型操作之基础篇》,里面详细介绍了其使用场景以及...
1.2. string string类型表示字符串,可以包含任意字符。 letstr:string='hello';lettemplate:string=`Hello,${ name}!`; 1.3. boolean boolean类型表示布尔值,只有两个可能的值:true和false。 letisDone:boolean=true;letisLogin:boolean=false; 1.4. null 和 undefined ...
declare type MethodDecorator=<T>(target:Object,propertyKey:string|symbol,descriptor:TypedPropertyDescriptor<T>)=>TypedPropertyDescriptor<T>|void; 返回值用于替换属性装饰器。 示例 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functionwritable(value:boolean){returnfunction(target:any,propertyKey:string,...
let color: string = "blue"; color = 'red'; // 多行字符串和模板字符串(template strings)使用反引号(backtick/backquote) let fullName: string = `Bob Bobbington`; let age: number = 37; let sentence: string = `Hello, my name is ${ fullName }. I'll be ${ age + 1 } years old...
functionprintValue(value:string|number):void{if(typeofvalue ==='string') {console.log(`The value is a string:${value}`);}elseif(typeofvalue ==='number') {console.log(`The value is a number:${value}`);}}classPerson {name:string;...
function doStuff(str: string) { // Error! // Type 'string' is not assignable to type '`hello ${string}`'. let x: `hello ${string}` = `hello ${str}` } This is because template string expressions with substitution slots ${likeThis} have always just had the type string. In turn,...