前台代码：
<title></title>
<script type="text/javascript">
function showImg() {
document.getElementById('img').setAttribute("src", "p_w_picpaths/图片1.png");
}
</script>
<style type="text/css">
.style1
{
width: 256px;
height: 256px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ImageButton ID="ImageButton1" runat="server" Height="48px"
ImageUrl="~/SystemManagement/p_w_picpaths/login_form_17.jpg"
Width="171px" />
<img id ="img" class="style1" src="p_w_picpaths/图片3.png" /></div>
</form>
</body>
</html>
后台调用：
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
Page.ClientScript.RegisterStartupScript(ClientScript.GetType(),"showImg", " <script>showImg();</script>");
}
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