文本框验证接受 javascript 中的端口 [英] textbox validation accepting Ports in javascript

问题描述

问题是在朋友的帮助下接受一个或多个端口之间有一个空格，我用这个来回答我的问题，但例如，如果我输入 88888，它会提醒我这样的事情:88888NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN 不正确

the question was accepting one or many ports that has one space between them with help of friends, I used this one for my answer but for example if I enter 88888 it will alert me such this thing: 88888NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN is not correct

我该如何纠正这个问题

<script type="text/javascript">
function portvalidating(field)
{
    var output='';
    m=field.value;
    if(/^\d{1,5}([ ]\d{1,5})*$/.test(m))
    {
        var parts = m.split(' ');
        for(i in parts)
        {
            var p= parseInt(parts[i]);
            if(!((0 <= p) && (p<= 65535) && !isNaN(p)))
            {
                output+=p;
            }
        }
        if(output=='')
            var dummy=1;
        else alert(output+'is not correct');
    }
    else alert('please enter a valid port!');
}

推荐答案

没有太多错误检查的粗略正则表达式是: exp =/\d{1,5}/g 然后调用 .match(exp) 在你的字符串上.但是，您需要使用 parseInt 将输出转换为数字，以便您可以根据约束检查它的值.

A crude regex without much error checking would be: exp = /\d{1,5}/g and then call .match(exp) on your string. However, you will need to use parseInt to convert the output to a number so that you can check it's value against your constraints.

我认为如果没有正则表达式，您可以更轻松地做到这一点.一些拆分和解析字符串的快速代码是:

I think you may be able to do this easier without Regex. Some quick code to split and parse a string is:

var s = "21 456 -32 70000";
var parts = s.split(' ');
var output;
for(i in parts)
{
  p = parseInt(parts[i]);
  if( (0 <= p) && (p <= 65535) && !isNaN(p) )
    output += p+"<br />";
}

希望这在某种程度上有所帮助.

Hopefully this helps to some degree.

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