1）基本思路：
要判断两个IP地址是否在同一个网段，将它们的IP地址分别与子网掩码做与运算，得到的结果为网络号，如果网络号相同，就在同一子网，否则，不在同一子网。
2）具体实现：
/**
* [isEqualIPAddress 判断两个IP地址是否在同一个网段]
* @param {[String]} addr1 [地址一]
* @param {[String]} addr2 [地址二]
* @param {[String]} mask [子网掩码]
* @return {Boolean} [true or false]
*/
function isEqualIPAddress (addr1,addr2,mask){
if(!addr1 || !addr2 || !mask){
console.log("各参数不能为空");
return false;
}
var
res1 = [],
res2 = [];
addr1 = addr1.split(".");
addr2 = addr2.split(".");
mask = mask.split(".");
for(var i = 0,ilen = addr1.length; i res1.push(parseInt(addr1[i]) & parseInt(mask[i]));
res2.push(parseInt(addr2[i]) & parseInt(mask[i]));
}
if(res1.join(".") == res2.join(".")){
console.log("在同一个网段");
return true;
}else{
console.log("不在同一个网段");
return false;
}
}
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