内联:

<输入名称=“号码”onkeyup=“if”值=这个值。“>

不显眼的风格(使用jQuery):

$(“输入[name = "数量"]”).keyup(函数(e) ｛ 如果(\ D / g.test (this.value)) ｛ //从输入值中过滤非数字。 这一点。Value = this.value。替换(\ D / g,”); ｝ })； < script src = " https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js " > < /脚本> <输入名称= "数量" >

这个jQuery代码可以过滤掉按住Shift, Ctrl或Alt时键入的字符。

$('#AmountText').keydown(function (e) {
    if (e.shiftKey || e.ctrlKey || e.altKey) { // if shift, ctrl or alt keys held down
        e.preventDefault();         // Prevent character input
    } else {
        var n = e.keyCode;
        if (!((n == 8)              // backspace
        || (n == 46)                // delete
        || (n >= 35 && n <= 40)     // arrow keys/home/end
        || (n >= 48 && n <= 57)     // numbers on keyboard
        || (n >= 96 && n <= 105))   // number on keypad
        ) {
            e.preventDefault();     // Prevent character input
        }
    }
});

在document.ready中添加以下代码

    $('.class of text box').keyup(function () 
    {
    this.value = this.value.replace(/[^0-9]/g, '');
    });  

你可以使用一个简单的JavaScript正则表达式来测试纯数字字符:

/^[0-9]+$/.test(input);

如果输入是数字，则返回true，否则返回false。

或事件键码，简单使用如下:

     // Allow: backspace, delete, tab, escape, enter, ctrl+A and .
    if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
         // Allow: Ctrl+A
        (e.keyCode == 65 && e.ctrlKey === true) || 
         // Allow: home, end, left, right
        (e.keyCode >= 35 && e.keyCode <= 39)) {
             // let it happen, don't do anything
             return;
    }

    var charValue = String.fromCharCode(e.keyCode)
        , valid = /^[0-9]+$/.test(charValue);

    if (!valid) {
        e.preventDefault();
    }

我认为这对每个人都有帮助

  $('input.valid-number').bind('keypress', function(e) { 
return ( e.which!=8 && e.which!=0 && (e.which<48 || e.which>57)) ? false : true ;
  })

有一个难以置信的兼容性问题，使用按键来检测被按下的字符…参见quirksmode了解更多信息。

我建议使用keyup来创建过滤器，因为这样就可以使用$(element).val()方法来计算实际的通用字符。

然后你可以过滤掉任何非数字使用正则表达式，如:

替换(/ [^ 0 - 9]/ g,”);

这就解决了所有的问题，比如移动和粘贴问题，因为总是有一个键up，所以值总是会被求值(除非javascript被关闭)。

所以…把它变成JQuery…这是我正在写的一个未完成的插件，它叫做inputmask，完成后将支持更多的掩码。现在它有数字掩码工作。

开始了……

/**
 * @author Tom Van Schoor
 * @company Tutuka Software
 */
(function($) {
  /**
   * @param {Object}
   * $$options options to override settings
   */
  jQuery.fn.inputmask = function($$options) {
    var $settings = $.extend( {}, $.fn.inputmask.defaults, $$options);

    return this.each(function() {
      // $this is an instance of the element you call the plug-in on
      var $this = $(this);

      /*
       * This plug-in does not depend on the metadata plug-in, but if this
       * plug-in detects the existence of the metadata plug-in it will
       * override options with the metadata provided by that plug-in. Look at
       * the metadata plug-in for more information.
       */
      // o will contain your defaults, overruled by $$options,
      // overruled by the meta-data
      var o = $.metadata ? $.extend( {}, $settings, $this.metadata()) : $settings;

      /*
       * if digits is in the array 'validators' provided by the options,
       * stack this event handler
       */
      if($.inArray('digits', o.validators) != -1) {
        $this.keyup(function(e) {
          $this.val(stripAlphaChars($this.val()));
        });
      }

      /*
       * There is no such things as public methods in jQuery plug-ins since
       * there is no console to perform commands from a client side point of
       * view. Typically only private methods will be fired by registered
       * events as on-click, on-drag, etc... Those registered events could be
       * seen as public methods.
       */

      // private method
      var stripAlphaChars = function(string) {
        var str = new String(string); 
        str = str.replace(/[^0-9]/g, ''); 
        return str;
      }

    });
  };

  // static public functions
  //jQuery.fn.inputmask.doSomething = function(attr) {

  //};

  // static public members
  //jQuery.fn.inputmask.someStaticPublicMember;

  // some default settings that can be overridden by either $$options or
  // metadata
  // If you need callback functions for the plug-in, this is where they get
  // set
  jQuery.fn.inputmask.defaults = {
    validators : []
  };
})(jQuery);

要使用它，只需这样做:

$('#someElementId').inputmask({
  validators: ['digits','someOtherNotYetImplementedValidator']
});

'someOtherNotYetImplementedValidator'只是在那里展示如何扩展它以用于额外的未来掩码/验证器。你可以添加或删除它，它不会破坏任何东西;-)

为这些额外杂乱的评论道歉，我使用的是我为这里的工作人员创建的模板。

希望这能有所帮助， 干杯