input框，金额的输入框增加自动格式化功能，求封装的代码？？

Question

描述，输123 =》123.00
54456.22=》54，456.22
及时显示。。

Answer 1

function cc(s){ if(/[^0-9\.]/.test(s)) return "invalid value"; s=s.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"); return "￥" + s.replace(/^\./,"0.") }