input type="button" class="body" id="subm" name="subm" value="寫好了，發布出去"
onclick="chkfull(this)"/>//注意類型是“按鈕”
input type="hidden" id="userchksense" name="userchksense" value="?"/>//嵌入一個隱藏的文本框，給Ajax傳值

function chkfull(bt){
var content = document.getElementById("usercontent").value;
if(content=="")
{
    alert("正文為必填。");//判斷文章內容是否為空
    return false;

}
else
{
    var xHRObject=false;

    if(window.XMLHttpRequest)//判斷瀏覽器內核
    {
        xHRObject=new XMLHttpRequest();
    }
    else if(window.ActiveXObject)
    {
        xHRObject= new ActiveXObject("Microsoft.XMLHTTP");
    }

    function get2()//定義get2函數，給onreadystatechange做準備。本函數不能放在xHRObject.onreadystatechange=get2;的后面
    {
        if(xHRObject.readyState==4 xHRObject.status==200)
        {
            var serverText=xHRObject.responseText;
            if(serverText=="sense")
            {
                if(confirm("你的文章有敏感詞匯，確定要發布嗎？\n\r【是，發布】將被審核，請等待。\n\r【否，不發布】將返回界面，請修改字句。"))
                {
                    bt.value="正在提交";
                    bt.disabled=true;//關閉按鈕
                    document.getElementById("userchksense").value="sense";//改變userchksense的值為sense，這樣，post到add.php就能直接檢查是否要鎖定本文，而不用再次檢查文章
                    document.form1.submit();//提交該表單
                }
                else//好像有點多余，不過這樣比較保險
                return false;
            }    
            else
            {
                bt.value="正在提交";
                bt.disabled=true;
                document.getElementById("userchksense").value="nonsense";
                document.form1.submit();
            }

        }
    }

    
    var title=document.getElementById("usertitle").value;
    var tag=document.getElementById("usertag").value;
    var intro=document.getElementById("userintro").value;
    var content=document.getElementById("usercontent").value;

    
    var v = "title="+title+"tag="+tag+"intro="+intro+"content="+content;
    xHRObject.open("POST","../ajax/ajax.php",true);    
    xHRObject.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

    xHRObject.onreadystatechange=get2;//此處的get2不能打括號，否則是將函數的返回值賦值給一個變量，而不是將本函數本身賦值給xHRObject.onreadystatechange（注釋1）
    xHRObject.send(v);
}

}