你不要使用 document.getElementsByTagName，通过 gridview.getElementsByTagName 来获取 checkbox 或遍历行的方式来做嘛
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.PrimaryKey = new DataColumn[] { dt.Columns["Id"] };
dt.Rows.Add(new object[] { 1, "Sam"});
dt.Rows.Add(new object[] { 2, "XXY" });
this.GridView1.DataSource = dt;
this.GridView1.DataBind();
this.GridView2.DataSource = dt;
this.GridView2.DataBind();
}
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>GridView 客户端全选</title>
<script language="javascript" type="text/javascript">
function CheckAll(gridView, checkBox)
{
for(var i = 0; i < gridView.rows.length; i ++)
{
gridView.rows[i].cells[0].getElementsByTagName("input")[0].checked = checkBox.checked;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="CheckBox1" onclick="CheckAll(document.getElementById('GridView1'),this);" runat="server" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Id" HeaderText="Id" />
<asp:BoundField DataField="Name" HeaderText="Name" />
</Columns>
</asp:GridView>
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="CheckBox1" onclick="CheckAll(document.getElementById('GridView2'),this);" runat="server" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Id" HeaderText="Id" />
<asp:BoundField DataField="Name" HeaderText="Name" />
</Columns>
</asp:GridView>
</form>
</body>
</html>
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