Question

textbox动态显示

<asp:TextBox ID="TextBox1" runat="server" onfocus="javascript:this.value=''" onblur="TextBox1(this)" ></asp:TextBox
<script type="text/javascript">
function TextBox1(object)
{
if (object.value == "")
{
object = "用户名";
}
}
</script>
这段话 那里有错误啊？

Answer 1

改成这样就可以了。
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<script type="text/javascript">
window.onload = function() {
var textbox1 = document.getElementById('TextBox1');
textbox1.onfocus = function() {
this.value = '';
};
textbox1.onblur = function() {
if(this.value == '')
this.value = '用户名';
};
};
</script>

Answer 2

改过另个函数名吧
应该是冲突了

Answer 3

控件名和函数名一样