完成工作的几个简单方法：
1：使用ClientScriptManager.RegisterClientScriptBlock调用直接在页面上插入脚本：

protected void Page_Load(object sender, EventArgs e) {

    // Not sure what your Tools.GetQueryObject is doing, but it should at 
    // the least be performing a UrlDecode to convert the string from any 
    // Url encoding, and as you're about to pass this back to javascript, 
    // you should also HtmlEncode it.
    string valueFromCodeBehind = "var myValue = " +
              Server.HtmlEncode(Server.UrlDecode(Request.QueryString["id"]));

    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Output the script block to the page.
    // Notes:
    // 1) I'm passing true as the final parameter to get the script manager
    //    to auto generate the script tags for me.
    // 2) You might need to call "RegisterStartupScript" if you need the  
    //    JS variables earlier in the page.
    cs.RegisterClientScriptBlock(this.GetType(),
                                 "SetValues", 
                                 valueFromCodeBehind,
                                 true);
  }
}

2：代码隐藏上的属性，在页面侧引用：
在你的.aspx页面中，类似这样的内容：

<script type="text/javascript">
  var myValue = <%=ValueFromCodeBehind%>
</script>

在后面的代码中，声明变量，并确保它已设置：

public partial class Testing: System.Web.UI.Page { 
  protected string ValueFromCodeBehind;

  protected void Page_Load(object sender, EventArgs e) {

    ValueFromCodeBehind = 
              Server.HtmlEncode(Server.UrlDecode(Request.QueryString["id"]));
  }

这是我最初的计划，但似乎有更好的方法来添加一个json对象，在智能方面，我注意到它在Page.RegisterClientScriptBlock（）旁边[已弃用]。

Page.RegisterClientScriptBlock("clientScript",
    string.Format("<script type='text/javascript' language='javascript'>objCase = {0}</script>", strJson));

这将在页面顶部注册您的脚本。

ClientScriptManager.RegisterClientScriptBlock Method (Type, Key as String, Script as String)

添加类型和键可确保只将该类型和键的一个脚本版本添加到页中。
在RegisterClientScriptBlock方法的此重载中，必须确保script参数中提供的脚本 Package 在元素块中。

在Adding Javascript file link in Master Page上找到此内容

protected void Page_Load(object sender, EventArgs e)
{
  Page.ClientScript.RegisterClientScriptInclude("somescript", ResolveUrl("some.js"));
}