这种数字怎么相加

Question

例如：123,533.80

这是金额，如果想让他123,533.80+100应该是123,633.80这种该怎么实现呢

加完之后逗号还得保留

Answer 1

function formatMoney(s, type) {  
    if (/[^0-9\.]/.test(s))  
        return "0";  
    if (s == null || s == "")  
        return "0";  
    s = s.toString().replace(/^(\d*)$/, "$1.");  
    s = (s + "00").replace(/(\d*\.\d\d)\d*/, "$1");  
    s = s.replace(".", ",");  
    var re = /(\d)(\d{3},)/;  
    while (re.test(s))  
        s = s.replace(re, "$1,$2");  
    s = s.replace(/,(\d\d)$/, ".$1");  
    if (type == 0) {
        var a = s.split(".");  
        if (a[1] == "00") {  
            s = a[0];  
        }  
    }  
    return s;  
}
var a = '123,456,789.55';
a = a.replace(/,/g,'');
a = parseFloat(a) + 100;
a = formatMoney(a, 0);
console.log(a);

Answer 2

var nums = '123,533.80'.split(',');
nums[1] = (Number(nums[1])+100);
nums.join(',');

Answer 3

var a = '123,533.80';
a = a.replace(/,/g,'');
a = parseFloat(a) + 100;
function formats(num) {
    var rgx = /(\d+)(\d{3})/,
        x1 = num + "";
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1
}
var newStr = formats(a.toFixed(2));

Answer 4

var a = '123,533.81';
var b = 100;
function sum(a, b) {
  var c = a.split(',');
  var d = Number(c[1]);
  return c[0] + ',' + (b + d);
}
sum(a, b);

Answer 5

var a = '123,456,789.55';

function add(str,num){
    var str1=str.replace(/,/g,"");
    var num1=parseFloat(str1)+num;
    var arr=num1.toString().split(".");
    function tho(x){
         return x<1000?x:tho(parseInt(x/1000))+","+tho(String(x).slice(-3))
    }
    return tho(arr[0])+"."+arr[1]
}
console.log(add(a,100)//应该所有的加法都可以实现