类型断言
let fangfang: any = "this is a string"; let geyao:number=(<string>fangfang).length; let geyao: number = (fangfang as string).length;
类型断言
let fangfang: any = "this is a string"; let geyao:number=(<string>fangfang).length; let geyao: number = (fangfang as string).length;