export default {} // 构造函数 var myFunction = new Function("a", "b", "return a*b"); var x = myFunction(4, 3); console.log(x); // 递归函数 function sum(arr: number[], n: number):number { if(n <= 0) { return 0; }else { return sum(arr, n-1) + arr[n-1]; } } // sum([2, 3, 4, 5], 2) + 4 // sum([2, 3, 4, 5], 1) + 3 + 4 // sum([2, 3, 4, 5], 0) + 2 + 3 + 4 // 0 + 2 + 3 + 4 = 9 let res = sum([2, 3, 4, 5], 3); console.log(res);