JS 保留小数点后两位

最笨的办法 function get() { var s = 25.127456 + ""; var str = s.substring(0,s.indexOf(".") + 3); alert(str); } 正则表达式 <script type="text/javascript"> onload = function(){ var a = "25.456322"; var aNew; var re = /([0-9]+\.[0-9]{2})[0-9]*/; aNew = a.replace(re,"$1"); alert(aNew); } </script> 机智 <script> var num=25.127456; alert( Math.round(num*100)/100); </script>

4.

<script> var num=25.127456; alert( num.toFixed(2)); </script>