初学，一个简单的问题

<select id=mySelect>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<br>
<br>
<input type=button value=click onclick="foo()">
<script>
function foo(){
mySelect.innerHTML = "";
}
</script>

解决方案 »

  1.   

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <HTML>
    <HEAD>
    <TITLE> New Document </TITLE>
    <META NAME="Generator" CONTENT="EditPlus">
    <META NAME="Author" CONTENT="">
    <META NAME="Keywords" CONTENT="">
    <META NAME="Description" CONTENT="">
    </HEAD><BODY>
    <select id=mySelect>
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    </select>
    <br>
    <br>
    <input type=button value=click onclick="foo()">
    <script>
    function foo(){
    mySelect.length = 0;
    }
    </script></BODY>
    </HTML>