Nodejs: net.isIP()使用示例及對常見IP字符串的驗證

net.isIP(input)使用示例及對常見IP字符串的驗證如下，net.isIPv4，net.isIPv6兩個函數的用法和net.isIP一樣，只是返回變成true/false。

> var net = require('net')
undefined
> net.isIP("10.1.7.23")
4
> net.isIP("2001:024f:ffff:ffff:ffff:ffff:ffff:fff1")
6
> net.isIP("2001:024f:ffff:ffff:ffff:ffff::")
6
> net.isIP("::")
6
> net.isIP("2001:024f:ffff:ffff:ffff:ffff:ffff:fff1a")
0
> net.isIP("2001:024f:ffff:ffff:ffff:ffff:ffff:fff11")
0
> net.isIP("::ffff:10.2.3.45")
6
> net.isIP("::a02:32d")
6
> net.isIP("::10.2.3.45")
6
> net.isIP("10.2.3.45")
4
> net.isIP("2001:024f::ffff:ffff::ffff:fff1")
0
> net.isIP("")
0
> net.isIP(null)
0