也允许负数

下面的代码也接受负数

HTML

<input type="text" name="myText" />

JS

var pastValue, pastSelectionStart, pastSelectionEnd;

$("input").on("keydown", function() {
    pastValue          = this.value;
    pastSelectionStart = this.selectionStart;
    pastSelectionEnd   = this.selectionEnd;
}).on("input propertychange", function() {

    if ( this.value.length > 0 && $.isNumeric(this.value) == false && this.value != '-' ) {
        this.value          = pastValue;
        this.selectionStart = pastSelectionStart;
        this.selectionEnd   = pastSelectionEnd;
    }
}).on('blur', function(){
        if(this.value == '-')
            this.value = '';
});

    $(".numeric").keypress(function(event) {
  // Backspace, tab, enter, end, home, left, right
  // We don't support the del key in Opera because del == . == 46.
  var controlKeys = [8, 9, 13, 35, 36, 37, 39];
  // IE doesn't support indexOf
  var isControlKey = controlKeys.join(",").match(new RegExp(event.which));
  // Some browsers just don't raise events for control keys. Easy.
  // e.g. Safari backspace.
  if (!event.which || // Control keys in most browsers. e.g. Firefox tab is 0
      (49 <= event.which && event.which <= 57) || // Always 1 through 9
      (48 == event.which && $(this).attr("value")) || // No 0 first digit
      isControlKey) { // Opera assigns values for control keys.
    return;
  } else {
    event.preventDefault();
  }
});

这段代码对我来说工作得很好，我只需要在controlKeys数组中添加46来使用句号，虽然我不认为是最好的方法;)

这是我刚刚完成的一个代码片段(使用Peter Mortensen / Keith Bentrup的一部分代码)，用于对文本字段进行整数百分比验证(jQuery是必需的):

/* This validates that the value of the text box corresponds
 * to a percentage expressed as an integer between 1 and 100,
 * otherwise adjust the text box value for this condition is met. */
$("[id*='percent_textfield']").keyup(function(e){
    if (!isNaN(parseInt(this.value,10))) {
        this.value = parseInt(this.value);
    } else {
        this.value = 0;
    }
    this.value = this.value.replace(/[^0-9]/g, '');
    if (parseInt(this.value,10) > 100) {
        this.value = 100;
        return;
    }
});

这段代码:

允许使用主数字键和数字键盘。 验证以排除shift数字字符(例如#，$，%等) 将NaN值替换为0 替换为100个大于100的值

我希望这能帮助到那些需要帮助的人。

／* 这是我的跨浏览器版本 如何允许只有数字(0-9)在HTML输入框使用jQuery? * /

$("#inputPrice").keydown(function(e){
    var keyPressed;
    if (!e) var e = window.event;
    if (e.keyCode) keyPressed = e.keyCode;
    else if (e.which) keyPressed = e.which;
    var hasDecimalPoint = (($(this).val().split('.').length-1)>0);
    if ( keyPressed == 46 || keyPressed == 8 ||((keyPressed == 190||keyPressed == 110)&&(!hasDecimalPoint && !e.shiftKey)) || keyPressed == 9 || keyPressed == 27 || keyPressed == 13 ||
             // Allow: Ctrl+A
            (keyPressed == 65 && e.ctrlKey === true) ||
             // Allow: home, end, left, right
            (keyPressed >= 35 && keyPressed <= 39)) {
                 // let it happen, don't do anything
                 return;
        }
        else {
            // Ensure that it is a number and stop the keypress
            if (e.shiftKey || (keyPressed < 48 || keyPressed > 57) && (keyPressed < 96 || keyPressed > 105 )) {
                e.preventDefault();
            }
        }

  });

如果你使用的是HTML5，你就不需要花大力气去执行验证。只要用——

<input type="number" step="any" />

step属性允许小数点有效。

作为对这个建议的轻微改进，您可以使用带有number()、digits和range方法的Validation插件。例如，下面的语句确保你得到一个0到50之间的正整数:

$("#myform").validate({
  rules: {
    field: {
      required: true,
      number: true,
      digits: true,
      range : [0, 50]
    }
  }
});