正着打星星（js）

//让用户输入行数，使用for循环嵌套打出正着的星星来，行数等于用户输入的数字

//例如：用户输入6

// *

// ***

// *****

// *******

// *********

// ***********

let readline = require("readline-sync");

console.log("请输入行数");

let line = readline.question("");

let strSpace = "";

let strStar = "";

let str = "";

for (let i = 1; i <= line; i++) {

for (let j = 1; j <= line - i; j++) {

strSpace = strSpace + " ";

}

for (let k = 1; k <= 2 * i - 1; k++) {

strStar = strStar + '*';

}

str = strSpace + strStar;

console.log(str);

str = "";

strSpace = "";

strStar = "";

}