jQuery数字输入掩码 [英] jQuery numeric input mask

问题描述

我正在尝试做一个简单的整数输入掩码，而不必包含整个插件，例如

I'm trying to do a simple integer numeric input mask without having to include an entire plugin like Digital Bush's masked input.

这是我从另一个stackoverflow问题重新利用"的代码:

Here's the code I've "repurposed" from another stackoverflow question:

$('input[name=Qty]').keyup(function() {
    var theEvent = evt || window.event;
    var key = theEvent.keyCode || theEvent.which;
    key = String.fromCharCode( key );
    var regex = '[0-9]'; /* Use |\. to include a decimal */
    if( !regex.test(key) ) {
     theEvent.returnValue = false;
     theEvent.preventDefault();
    }
});

错误在第一行，它不知道什么是evt.
我想我需要使用$(this).

The error is on the first line, where it doesn't know what evt is.
I think I need to use $(this) something.

推荐答案

函数参数中缺少evt:

$('input[name=Qty]').keyup(function(evt) {
                                     ^

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