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;  });