數組隨機 / js 保留兩位小數（整數不補零）

數組隨機

const provinceArr = ["北京市","天津市","河北省","山西省","遼寧省","吉林省","黑龍江省","上海市","江蘇省","浙江省","安徽省","福建省","江西省","山東省","河南省","湖北省","湖南省","廣東省","海南省","重慶市","四川省","貴州省","雲南省","陝西省","甘肅省","青海省"];

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

const text = '歡迎來自'+this.provinceArr+'的朋友';

console.log(text )

 

js 保留兩位小數（整數不補零）

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