//校驗IP地址，子網掩碼和預設閘道器的關係是否正確。w是預設閘道器，y是子網掩碼，i是IP地址。

function checkIp(w,y,i){
    var ws = w.split('.');
    var ys = y.split('.');
    var is = i.split('.');
    for(var index in ws){
        var cw = to8Bit(ws[index]);
        var cy = to8Bit(ys[index]);
        var ci = to8Bit(is[index]);
        for(var 
 
jndex = 0;jndex < 8;jndex++){
            if(cy[jndex]=="1"){
                if(cw[jndex] != ci[jndex]) return false;
            }
        }
    }
    return true;
}
function to8Bit(number){
    var result = parseInt(number).toString(2);
    while(result.length < 8){
        result = "0" + result
 
;
    }
    return result;
}