$.each() each

var arr1 = [ "aaa", "bbb", "ccc" ]; 
$.each(arr1, function(i,val){ 
alert(i); 
alert(val);
});

var obj = { one:1, two:2, three:3}; 
$.each(obj, function(key, val) { 
alert(key); 
alert(val); 
});

<input name="aaa" type="hidden" value="111" />
<input name="bbb" type="hidden" value="222" />
<input name="ccc" type="hidden" value="333" />
<input name="ddd" type="hidden" value="444"/>

$.each($("input:hidden"), function(i,val){ 
alert(val);
alert(i);
alert(val.name);
alert(val.value); 
});