var data = ["1,2,3\n","4,5,6"] // 每一行数据为一个字符串，字符串用“,”隔开，并且在每一行加上换行符

var blob = new Blob(data, {type:"text/csv,charset=UTF-8"})

var csvUrl = URL.createObjectURL(blob)

var aEle = document.createElement("a")

aEle.download = "data.csv" //文件名随意

aEle.href = csvUrl

aEle.click()