~~~ /** * 格式化数字串 * @param {String} str 源字符串 * @param {Number} size 每隔几个字符进行分割 默认3 * @param {String} delimiter delimiter-分割符 默认',' */ function formatText(str, size = 3, delimiter = ',') { let _str = str.toString(), regText = '\\d{1,' + size + '}(?=(\\d{' + size + '})+$)', reg = new RegExp(regText, 'g'); return _str.replace(/^(-?)(\d+)((\.\d+)?)$/, function ($0, $1, $2, $3) { return $1 + $2.replace(reg, `$&${delimiter}`) + $3; }) } ~~~