数组随机 / js 保留两位小数（整数不补零）

数组随机

const provinceArr = ["北京市","天津市","河北省","山西省","辽宁省","吉林省","黑龙江省","上海市","江苏省","浙江省","安徽省","福建省","江西省","山东省","河南省","湖北省","湖南省","广东省","海南省","重庆市","四川省","贵州省","云南省","陕西省","甘肃省","青海省"];

var provinceArr= provinceArr[Math.floor(Math.random()*provinceArr.length)];

const text = '欢迎来自'+this.provinceArr+'的朋友';

console.log(text )

js 保留两位小数（整数不补零）

parseFloat((this.old_price*1-this.price*1).toFixed(2))