function getInfo(name:string):string;
function getInfo(name:string,age:number):string;
function getInfo(name:any,age?:any):any{
    if (age) {
        return '我叫---'+name+'我的年龄是'+age
        
    }
    else{
        return '我是'+name
    }
}
console.log(getInfo("李四"))
console.log(getInfo("李四",20))