泛型

声明一个方法，同时返回string,number类型

问题

function getData1(value:string):string{    return value;}function getData2(value:number):number{    return value;}console.log(getData1('aa'));console.log(getData2(11));

利用any来解决,但是放弃了类型教验

function getData(value:any):any{    return value;}console.log(getData('aa'));console.log(getData(11));

利用泛型

function getData
    
     (value:T):T{    return value;}console.log(getData
     
      (123));console.log(getData
      
       ('aaa'));
      
     
    

获取数组最小值

未使用泛型

要同时实现string,number,要写2个类来实现

number

class MinClass{    public list:number[]=[];    add(num:number){        this.list.push(num);    }    min():number{        var minNum = this.list[0];        for(var i =0;i
    
      this.list[i]){                minNum = this.list[i]            }        }        return minNum;    }}var m = new MinClass();m.add(1);m.add(6);m.add(2);m.add(11);console.log(m.min());
    

string

class MinClass{    public list:string[]=[];    add(num:string){        this.list.push(num);    }    min():string{        var minNum = this.list[0];        for(var i =0;i
    
      this.list[i]){                minNum = this.list[i]            }        }        return minNum;    }}var m = new MinClass();m.add('a');m.add('c');m.add('b');console.log(m.min());
    

泛型

一个类，同时实现string,number

class MinClass
    
     {    public list:T[]=[];    add(num:T):void{        this.list.push(num);    }    min():T{        var minNum = this.list[0];        for(var i =0;i
     
       this.list[i]){                minNum = this.list[i]            }        }        return minNum;    }}var m = new MinClass
      
       ();m.add(1);m.add(6);m.add(2);m.add(11);console.log(m.min());var s = new MinClass
       
        ();s.add('a');s.add('b');s.add('f');s.add('d');console.log(s.min());
       
      
     
    

泛型接口

未使用泛型

interface ConfigFn{    (value1:string,value2:string):string;}var setData:ConfigFn = function(value1:string,value2:string):string{    return value1+value2;}console.log(setData('name','list'));

使用泛型

interface ConfigFn{    
    
     (value:T):T;}var setData:ConfigFn= function
     
      (value:T):T{    return value;}console.log(setData
      
       ('aa'));console.log(setData
       
        (123));