<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>h5</title> <style type="text/css"> *{ margin: 0;padding: 0; } input{ width: 500px; height: 100px; font-size: 40px; } </style> </head> <body> <input type="text" name="" value="" οninput="checkNum(this)"> <script src="js/jquery-2.1.0.js"></script> <script type="text/javascript"> //限制number 输入格式 function checkNum(obj){ obj.value = obj.value.replace(/[^\d.]/g,"");//清除"数字"和"."以外的字符 obj.value = obj.value.replace(/^\./g,"");//验证第一个字符是数字而不是 obj.value = obj.value.replace(/\.{2,}/g,".");//只保留第一个. 清除多余的 obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$","."); obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3');//只能输入三个小数.(\d\d\d) 修改个数 加\d } </script> </body> </html>
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