正则验证小数点后面只能有两位数的方法

<input type="text" onkeyup="value=value.replace(/\.\d{2,}$/,value.substr(value.indexof('.'),3))" /> 

jquery.validator.addmethod("lrunlv", function(value, element) {     
return this.optional(element) || /^\d+(\.\d{1,2})?$/.test(value);     
}, "小数位不能超过三位");  

jquery.validator.addmethod("decimals", function(value, element,d){ 
   var a = value.indexof(".")+1; 
   if(a==0){ 
    a=value.length; 
   } 
   var b = value.length; 
   var c = b-a; 
  return this.optional(element) || c<=d;  
});