谈SELECT 连选

<ww:select name="nameA" onchange="changeItem(this.value)" list="{'飞机','火车'}" />

<ww.select id="item" name="nameB" list={}/>

<script>
function changeItem(val){

var item= $("nameB");

item.options.length = 0;

if(val == "飞机"){

i = item.options.length;
item.option[i] = document.createElement("option");
item.option[i].text = "头等仓"；
item.option[i].value ="头等仓";
}

}
</script>