<script>
var taxRitsu=new Array();
taxRitsu["A"]="3";
taxRitsu["B"]="0";
taxRitsu["C"]="100";
taxRitsu["D"]="3";
taxRitsu["E"]="5";
taxRitsu["X"]="10";
alert(taxRitsu["X"]);
</script>IE6是可以的