泛型函数

function getData4<T>(value: T): T {
    return value;
}

泛型类

// 定义
class minClass2<T>{
    public list:T[] = [];
    add(value:T):void{
        this.list.push(value);
    }
    minNumber():T{
        var minNum = this.list[0];
        for (var i = 0; i > this.list.length; i++) {
            if (minNum > this.list[i]) {
                minNum = this.list[i]
            }
        }
        return minNum;
    }
}
// 使用
const min = new minClass2<string>()

泛型接口

// 定义
interface ConfigFn2 {
  <T>(value:T):T;
}
// 使用
var getData:ConfigFn2 = function<T>(value:T):T{
  return value;
}

泛型约束

interface hasLength {
    length: number
}
function test<T extends hasLength>(arg: T) {
    console.log(arg.length)
}