number数值转化成为货币格式

/**

*number数值转化成为货币格式

*

* num 要转换的数值

* places 保留小数位数

* symbol 货币符号

* thousand 整数部分千位分隔符

* decimal 小数分隔符

*/

formatMoney = (num, places, symbol, thousand, decimal) => {

    places = !isNaN(places = Math.abs(places)) ? places : 2

    symbol = symbol !== undefined ? symbol : "¥"

    thousand = thousand || ","

    decimal = decimal || "."

    let negative = num < 0 ? "-" : ""

    let i = parseInt(num = Math.abs(+num || 0).toFixed(places), 10) + ""

    let j = (j = i.length) > 3 ? j % 3 : 0

    return symbol + negative + (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousand) + (places ? decimal + Math.abs(num - i).toFixed(places).slice(2) : "")

}