JS添加千分位

JS添加千分位

第一段if可去

第二段if中num!==''解释：

0==''  -->  true

0==='' --> false

        //设置千分位
        function toThousands(num, decLength) {
            if (num == "0") {
                return "";
            }
            if (num !== "" && num != null && num != undefined) {
                num = String(num);
                if (decLength > 0) {
                    num = parseFloat(num).toFixed(decLength);
                }
                else {
                    num = parseInt(num);
                }
                var re = /\d{1,3}(?=(\d{3})+$)/g;
                var n = (num).toString().replace(/^(\d+)((\.\d+)?)$/, function (s, s1, s2) { return s1.replace(re, "$&,") + s2; });
                return n;
            } else {
                return "";
            }
        }