下拉列表框JS 写 代码

 <script language="JavaScript" type="text/JavaScript">
    var obj=document.getElementById('testCaseName');
    obj.options.add(new Option("",""));
    <%
    if (testCaseLst!=null){
        for (int i = 0; i < testCaseLst.length; i++) {
           
            %>  
    obj.options.add(new Option("<%=existName%>","<%=existName%>"));
            <%

        }
    }
    %>
</script>