Javascript函数之后没有回发

这个元素

<asp:DropDownList ID="ItemDropDownList" runat="server" AutoPostBack="true" OnChange="setHidden()" .... >

---

怎么了？

使用return语句而不是post-back

<asp:DropDownList ID="ItemDropDownList"  runat="server"  AutoPostBack="true" 
     OnChange="return setHidden()" .... >

function setHidden() {
     ...
     ....
    return true; // you can return false to stop postback
}

函数setHidden（）{
...
....
return true；//可以返回false来停止回发
}

<asp:DropDownList ID="ItemDropDownList"  runat="server"  AutoPostBack="true" 
     OnChange="return setHidden()" .... >

function setHidden() {
     ...
     ....
    return true; // you can return false to stop postback
}