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TS断言类型断言好比其他语言里的类型转换，但是不进行特殊的数据检查和解构，它没有运行时的影响，只是在编译阶段起作用。类型断言有两种形式：尖括号语法let someValue:any = "this is a string";let strLength:number = (<string>someValue).lengthas 语法let someValue:any = "this is a string";let strLength:number = (some

TS的基础类型Boolean类型let isDo:boolean = true; === var isDo = trueNumber类型let num:number = 5; === var num = 5String类型let name:string = 'mery'; === var name = 'mery'Array类型let arr:number[] = [1,2,3]; === var arr =[1,2,3]let