文本框只能输入正整数

Question

正整数的正则表达式:
var RegExp = ^[\d]+$; 
var RegExp ="^[0-9]*[1-9][0-9]*$" 

Answer 1

                            jQuery("#itemprice").keydown(function (event) {                                if ((event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105) && event.keyCode != 8 && event.keyCode != 190) {
                                    return false;
                                }                            });

Answer 2

http://fineui.com/demo/#/demo/form/numberbox.aspx