javascript 取后台值

 <script type="text/javascript" language="javascript">
        var testInput;
        <asp:Literal id="literal" runat="server"></asp:Literal>
        alert(testInput);
 </script>　　

 protected void Page_Load(object sender, EventArgs e)
{
    string test = "HelloWorld";

    this.literal.Text = "testInput=\"" + test + "\";";
}