简短而甜蜜——即使在30多个答案之后，这一点永远不会得到太多关注;)

  $('#number_only').bind('keyup paste', function(){
        this.value = this.value.replace(/[^0-9]/g, '');
  });

没有一个答案在我的情况下工作，所以我在接受的答案做了一点改变，使它为动态添加的元素工作。

享受:

var inputFilter = function (elem, cb) {
    /*
    *    /^-?\d*$/               restricts input to integer numbers
    *    /^\d*$/                 restricts input to unsigned integer numbers
    *    /^[0-9a-f]*$/i          restricts input to hexadecimal numbers
    *    /^-?\d*[.,]?\d*$/       restricts input to floating point numbers (allowing both . and , as decimal separator)
    *    /^-?\d*[.,]?\d{0,2}$/   restricts input to currency values (i.e. at most two decimal places)
    */
    bdy.on('input keydown keyup mousedown mouseup select contextmenu drop', elem, function () {
        if (cb(this.value)) {
            this.oldValue = this.value;
            this.oldSelectionStart = this.selectionStart;
            this.oldSelectionEnd = this.selectionEnd;
        } else if (this.hasOwnProperty('oldValue')) {
            this.value = this.oldValue;
            this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
        }
    });
};

用法:

inputFilter('#onlyDigitsInput', function (val) {
    return /^\d*$/.test(val);
});

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

我想出了一个非常好的简单的解决方案，它不会像其他解决方案那样阻止用户选择文本或复制粘贴。jQuery样式:)

$("input.inputPhone").keyup(function() {
    var jThis=$(this);
    var notNumber=new RegExp("[^0-9]","g");
    var val=jThis.val();

    //Math before replacing to prevent losing keyboard selection 
    if(val.match(notNumber))
    { jThis.val(val.replace(notNumber,"")); }
}).keyup(); //Trigger on page load to sanitize values set by server

我也想回答:)

    $('.justNum').keydown(function(event){
        var kc, num, rt = false;
        kc = event.keyCode;
        if(kc == 8 || ((kc > 47 && kc < 58) || (kc > 95 && kc < 106))) rt = true;
        return rt;
    })
    .bind('blur', function(){
        num = parseInt($(this).val());
        num = isNaN(num) ? '' : num;
        if(num && num < 0) num = num*-1;
        $(this).val(num);
    });

就是这样……只是数字。:)几乎只用“模糊”就可以了，但是……

我把所有的答案结合在一起，得出了以下代码:

jQuery('#input_id', function(e){
    // Allow: backspace, delete, tab, escape, enter
    if (jQuery.inArray(e.keyCode, [46, 8, 9, 27, 13, 110]) !== -1 ||
        // Allow: Ctrl+A
        (e.keyCode === 65 && e.ctrlKey === true) ||
        // Allow: Ctrl+C
        (e.keyCode === 67 && e.ctrlKey === true) ||
        // Allow: Ctrl+X
        (e.keyCode === 88 && e.ctrlKey === true) ||
        // Disallow several dots (allow 190 only if no dots found)
        (e.keyCode === 190 && jQuery(this).val().indexOf('.') == -1) ||
        // Bug in some Android devices where it is always 229
        (e.keyCode === 229) ||
        // Allow: home, end, left, right
        (e.keyCode >= 35 && e.keyCode <= 40)) {
        // let it happen, don't do anything
        return;
    }
    // Ensure that it is a number and stop the keypress
    if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
        e.preventDefault();
    }
});

此外，表单应该有autocomplete="off"。如果没有这个选项，你可能会在移动设备上遇到自动补全算法的问题。