js代码：
//验证数字var validNumber = {//只能正整数validAll: function (obj) {var num = $.trim($(obj).val());num = num.replace(/[^0-9]/g, "")if ((num.length == 1) && (num == '.')) {num = num.replace(/./, '')}$(obj).val(num)},//验证数字 整数 有负数 有小数validNum: function (obj) {var num = $.trim($(obj).val());num = num.replace(/[^0-9-.]/g, "");var dem = num.indexOf('.');if (dem == 0) {num = '';} else if (dem > 0) {var demStr1 = num.substring(0, dem+1);var demStr2 = num.substring(dem + 1, num.length);demStr2 = demStr2.replace(/\./g, "");num = demStr1 + demStr2;}var firstNum = num.substring(0, 1);var otherNUm = num.substring(1, num.length);otherNUm = otherNUm.replace(/-/g, "");num = firstNum + '' + otherNUm;$(obj).val(num)},//验证数字 小数validNumDec:function (obj){var num=$.trim($(obj).val());num=num.replace(/[^0-9.]/g,"")if((num.length==1)&&(num=='.')){num=num.replace(/\./,'')}$(obj).val(num)},//验证数字 百分数validNumPer:function (obj){var num=$.trim($(obj).val());num=num.replace(/[^0-9.]/g,"");if ((num.length == 1) && (num == '.')) {num=num.replace(/./,'')}if((num-0)>100){alert('数值不能大于100');$(obj).val('')}else{$(obj).val(num)}}}
HTML代码：
<input type="text" οninput="validNumber.validAll(this)"/>
这里根据需要来调用不同的函数，如果是只能填写0和正整数，就调用validAll
实现效果：
输入0和正整数外的其他字符都是无法输入的。
