JS——打印倒三角和正三角

let readline = require("readline-sync");
console.log("请输入行数");
let line = readline.question("");
let c ="";
let d ="";
let f ="";
for(let i =line;i>=1;i--){
for(let j =line-i;j>=1;j--){
c +=" ";
}
for(let k =2*i-1; k>=1; k--){
d +="*";
}
f = c+d;
console.log(f);
c ="";
d ="";
f ="";
}

let read=require("readline-sync")
console.log("请输入个数字")
let num=read.question("")
let kg=""//空格
let xx =""    //星星*
let link =""   //打印
for(var i=1;i<=num;i++){
    for(var j=1;j<=num-i;j++){ //控制空格数
        kg+=" "
    }
    for(var k=1;k<=2*i-1;k++){ //控制*的数量
        xx+="*"
    }
    link=kg + xx;
    console.log(link)
    link=""
    kg=""
    xx=""
}