给输入字段一个类(<input class="digit"…>)和使用jquery如下所示。

jQuery(document).ready(function () {
            jQuery('input.digit').live('input keyup',function(e){ jQuery(this).val(jQuery(this).val().replace( /[^\d]/g ,'')); });
});

上面的代码还可以禁用Ctrl+V笔画和右键单击笔画中的特殊字符。

<input type="tel" 
          onkeypress="return onlyNumberKey(event)">

脚本内标记

function onlyNumberKey(evt) { 
      
      // Only ASCII charactar in that range allowed 
      var ASCIICode = (evt.which) ? evt.which : evt.keyCode 
      if (ASCIICode > 31 && (ASCIICode < 48 || ASCIICode > 57)) 
          return false; 
      return true; 
} 

下面是emkey08的JavaScript Wiki答案的一个面向对象的重新实现，它使用了一个EventListener对象实现。(参见:MDN web docs EventListener)

在某种程度上，它可以防止为每个过滤后的输入元素重复匿名事件处理程序函数声明，同时仍然允许它通过可选的回调。

/** * Base input {@see Element} {@see EventListener} filter abstract class * * @implements EventListener */ class AbstractInputFilter { /** * Attach the input filter to the input {@see Element} * * @param inputElement The input {@see Element} to filter * @param isValid - The callback that determines if the input is valid. * @throws Error */ constructor(inputElement, isValid = null) { // Abstract class if (this.constructor === AbstractInputFilter) { throw new Error("Object of Abstract Class cannot be created"); } if (typeof isValid === "function") { this.isValid = isValid; } for (const event of ["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop"]) { inputElement.addEventListener(event, this); } } /** * Checks the value is valid * * @callback isValid default call-back that will throw * an {Error} if not implemented by extending this * {AbstractInputFilter} class. * * @param value The value to check * @returns {boolean} * @throws Error */ isValid(value) { throw new Error('must be implemented by callback!'); } /** * Handles the {@see event} dispatched by * the {@see EventTarget} object from the input {@see Element} * to filter its contant while it is being filled. * * @param event the {@see event} dispatched by * the {@see EventTarget} input {@see Element} * @override */ handleEvent(event) { const inputElement = event.currentTarget; if (this.isValid(inputElement.value)) { inputElement.oldValue = inputElement.value; inputElement.oldSelectionStart = inputElement.selectionStart; inputElement.oldSelectionEnd = inputElement.selectionEnd; } else if (inputElement.hasOwnProperty("oldValue")) { inputElement.value = inputElement.oldValue; inputElement.setSelectionRange( inputElement.oldSelectionStart, inputElement.oldSelectionEnd); } else { this.value = ""; } } } /** * Generic Input element {@see EventListener} filter * * @extends AbstractInputFilter * It needs the {@see AbstractInputFilter~isValid} callback * to determine if the input is valid. */ class InputFilter extends AbstractInputFilter {} /** * Unsigned Integer Input element {@see EventListener} filter * @extends AbstractInputFilter */ class UIntInputFilter extends AbstractInputFilter { isValid(value) { return /^\d*$/.test(value); } } /** * Unsigned Float Input element {@see EventListener} filter * @extends AbstractInputFilter */ class UFloatInputFilter extends AbstractInputFilter { isValid(value) { return /^\d*\.?\d*$/.test(value); } } // Filter with pre-made InputFilters (re-use the filter) new UIntInputFilter(document.getElementById("UInt")); new UFloatInputFilter(document.getElementById("UFloat")); // Filter with custom callback filter anonymous function new InputFilter(document.getElementById("AlNum"), function(value) { return /^\w*$/.test(value); }); <label>Unsigned integer: </label><input id="UInt"><br/> <label>Unsigned float: </label><input id="UFloat"><br/> <label>AlphaNumeric (no special characters): </label><input id="AlNum">

再举一个例子，你可以在输入字段中只添加数字，不能添加字母

<input type="text" class="form-control" id="phone" name="phone" placeholder="PHONE" spellcheck="false" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');">

只是使用jQuery的另一个变体

$(".numeric").keypress(function() {
    return (/\d/.test(String.fromCharCode(event.which) ))
});

你可以附加到key down事件，然后根据你需要过滤键，例如:

<input id="FIELD_ID" name="FIELD_ID" onkeypress="return validateNUM(event,this);"  type="text">

实际的JavaScript处理程序是:

function validateNUM(e,field)
{
    var key = getKeyEvent(e)
    if (specialKey(key)) return true;
    if ((key >= 48 && key <= 57) || (key == 46)){
        if (key != 46)
            return true;
        else{
            if (field.value.search(/\./) == -1 && field.value.length > 0)
                return true;
            else
                return false;
        }
    }

function getKeyEvent(e){
    var keynum
    var keychar
    var numcheck
    if(window.event) // IE
        keynum = e.keyCode
    else if(e.which) // Netscape/Firefox/Opera
        keynum = e.which
    return keynum;
}