用这种形式。在我看来，允许home, end, shift和ctrl这样的键是正确的，缺点是用户可以打印特殊字符:

$("#busca_cep").keydown(function(event) {
    if ( event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 13 || event.keyCode == 16 || event.keyCode == 36 || event.keyCode == 35) {
        if (event.keyCode == 13) {
            localiza_cep(this.value);
        }
    } else {
        if ((event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
            event.preventDefault(); 
        }   
    }
});

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" >

$(document).ready(function() {
    $("#txtboxToFilter").keydown(function(event) {
        // Allow only backspace and delete
        if ( event.keyCode == 46 || event.keyCode == 8 ) {
            // let it happen, don't do anything
        }
        else {
            // Ensure that it is a number and stop the keypress
            if (event.keyCode < 48 || event.keyCode > 57 ) {
                event.preventDefault(); 
            }   
        }
    });
});

来源:http://snipt.net/GerryEng/jquery-making-textfield-only-accept-numeric-values

检查小数点是否已经使用:-

        // Stop: Multiple decimal points
        if((e.keyCode == 190 || e.keyCode == 110) && ((this.value).indexOf(".") >= 0))
            e.preventDefault(); 

需要确保你有数字键盘和tab键工作

 // Allow only backspace and delete
            if (event.keyCode == 46 || event.keyCode == 8  || event.keyCode == 9) {
                // let it happen, don't do anything
            }
            else {
                // Ensure that it is a number and stop the keypress
                if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105)) {

                }
                else {
                    event.preventDefault();
                }
            }

你可以使用这个JavaScript函数:

function maskInput(e) {
    //check if we have "e" or "window.event" and use them as "event"
        //Firefox doesn't have window.event 
    var event = e || window.event 

    var key_code = event.keyCode;
    var oElement = e ? e.target : window.event.srcElement;
    if (!event.shiftKey && !event.ctrlKey && !event.altKey) {
        if ((key_code > 47 && key_code < 58) ||
            (key_code > 95 && key_code < 106)) {

            if (key_code > 95)
                 key_code -= (95-47);
            oElement.value = oElement.value;
        } else if(key_code == 8) {
            oElement.value = oElement.value;
        } else if(key_code != 9) {
            event.returnValue = false;
        }
    }
}

你可以像这样把它绑定到你的文本框:

$(document).ready(function() {
    $('#myTextbox').keydown(maskInput);
});

我在生产中使用了上面的方法，它工作得很好，而且是跨浏览器的。此外，它不依赖于jQuery，所以你可以用内联JavaScript将它绑定到你的文本框:

<input type="text" name="aNumberField" onkeydown="javascript:maskInput()"/>