前端js/後端cs互相傳值

test.aspx(前端) 

//新增一個hidden變數, 前後端pass value可透過此變數(常用手法)
<input type="hidden" id="abc" runat='server' />
 
//新增一個js, 把要傳給後端的參數寫到hidden變數
<script type="text/javascript">
function setvalue() {
  var a = document.getElementById("abc");
  a.value = "這是js要給後端的參數";
} 
</script>

test.aspx.cs(後端) 

Label1.Text = "承接js傳過來的參數是 "+ Request.Params["abc"];

後端CS傳值給前端JS 

test.aspx.cs(後端) 

protected void Page_Load(object sender, EventArgs e) {
  form1.InnerHtml = "";
  for (int i = 0; i < 10; i++) {
    form1.InnerHtml += "<button onclick='send(" + i + ")'>click</button>";
  }
}

test.aspx(前端) 

<script type="text/javascript">
  function send(id) {
    alert(id);
  }
</script>