"A" , . arrName. arrName.length, , 21 (0,1,2,..., 20). ( -). - :
<script type="text/javascript">
var obj = {};
obj[20] = 'C';
obj[10] = 'B';
obj[-10] = 'A';
var indexes = [];
for(var i in obj){
indexes.push(i);
}
indexes.sort(function(a,b){
return a-b;
});
for(var i=0,l=indexes.length; i<l; i++){
document.write(obj[indexes[i]] + ' ');
}
</script>