用Javascript取float型小数点后两位,例22.127456取成22.13,如何做?
1.这种方法最不推荐:
function get(){var s = 22.127456 + "";var str = s.substring(0,s.indexOf(".") + 3);alert(str);}
2. 使用正则表达式获取:
function get(){var a = "23.456322";var aNew;var re = /([0-9]+\.[0-9]{2})[0-9]*/;aNew = a.replace(re,"$1");alert(aNew);}
3. 比较高级的应用:
function get(){var num=22.127456;alert( Math.round(num*100)/100);}
4. 最简单也最方便的:
function get(){var num = new Number(13.37);num = num.toFixed(2);//2为要获取小数后的位数 会自动四舍五入alert(num);}