/**
* js 千分符
* @param num
* @returns {string}
*/
function groupSeparator(num) {
num = num + '';
if(!num.includes('.')){
num += '.'
}
return num.replace(/(\d)(?=(\d{3})+\.)/g, function ($0, $1) {
return $1 + ',';
}).replace(/\.$/, '');
}