OnClientClick="return YourFunction();"//这里函数名前加上return

function YourFunction()
{
    if(condition...)
    {
        //do something...
        return true;
    }
    else
    {
        //do something...
        return false;
    }
}

------解决方案--------------------
探讨

as following-> 

OnClientClick="if(confirm('continue....')) return true; else return false;"