배열 안에 있는 지 확인

function cli_k_re(){
var area1 = new Array(20170721,20170722,20170723,20170724,20170725,20170726,20170727,20170728,20170729,20170730,20170731,20170801,20170802,20170803,20170804,20170805,20170806,20170807,20170808,20170809,20170810,20170811,20170812,20170813,20170814,20170815,20170816);
var lodging_value = 20170805;
for(hi=0;hi<27;hi++){

//alert(area1[hi]+"=="+lodging_value);
if(area1[hi]==lodging_value){
cli_k_return=true;
}else{
cli_k_return=false;
}

if(cli_k_return==true){hi=28; }
}
return cli_k_return;
}