// 正则 数字超过1000 千分符展示
thousandBitSeparator(n) {
      let re = /\d{1,3}(?=(\d{3})+$)/g;

      let n1 = n.toString().replace(/^(\d+)((\.\d+)?)$/,function(s,s1,s2){return s1.replace(re, '$&,') + s2});
       return n1;
 }