javascript的小问题函数blz（） { //警报（“asdf”）； //document.getElementById（“link”）.innerHTML=https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； document.getElementById（“link”）.innerHTML=encodeURI（“https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+document.getElementById（“产品”）.value+”&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=“+document.getElementById（“主题”）.value”+“&caption=邀请%20在%20Gogmat上签出%20product%20on%20Gogmat&description=检查%20this%20product%20on%20social.gogmat.com%20now.%0A”+document.getElementById（“message”）.value+“&message=检查%20this%20product%20on%20on%20social.gogmat.com%20now.%.%+document.getElementById（“message”）.value+”&redirect_uri=“+document.getElementById（“重定向”）.value”）； //document.getElementById（'button1'）。href='0https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； } 主题：个人信息：选择要推荐的产品：链接返回：_Javascript_Function

javascript的小问题函数blz（） { //警报（“asdf”）； //document.getElementById（“link”）.innerHTML=https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； document.getElementById（“link”）.innerHTML=encodeURI（“https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+document.getElementById（“产品”）.value+”&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=“+document.getElementById（“主题”）.value”+“&caption=邀请%20在%20Gogmat上签出%20product%20on%20Gogmat&description=检查%20this%20product%20on%20social.gogmat.com%20now.%0A”+document.getElementById（“message”）.value+“&message=检查%20this%20product%20on%20on%20social.gogmat.com%20now.%.%+document.getElementById（“message”）.value+”&redirect_uri=“+document.getElementById（“重定向”）.value”）； //document.getElementById（'button1'）。href='0https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； } 主题：个人信息：选择要推荐的产品：链接返回：

javascript function

javascript的小问题函数blz（） { //警报（“asdf”）； //document.getElementById（“link”）.innerHTML=https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； document.getElementById（“link”）.innerHTML=encodeURI（“https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+document.getElementById（“产品”）.value+”&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=“+document.getElementById（“主题”）.value”+“&caption=邀请%20在%20Gogmat上签出%20product%20on%20Gogmat&description=检查%20this%20product%20on%20social.gogmat.com%20now.%0A”+document.getElementById（“message”）.value+“&message=检查%20this%20product%20on%20on%20social.gogmat.com%20now.%.%+document.getElementById（“message”）.value+”&redirect_uri=“+document.getElementById（“重定向”）.value”）； //document.getElementById（'button1'）。href='0https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）； } 主题：个人信息：选择要推荐的产品：链接返回：,javascript,function,Javascript,Function,这可能有什么问题，我正面临上述代码的问题，它没有在textarea或锚定标记的href部分显示文本，我第一次在javascript中对此感到完全困惑。要设置的值，请更新其“value”属性： <html> <head> <script type="text/javascript"> function blz() { //alert("asdf"); //document.getElementById("link").innerHTML='https://www

这可能有什么问题，我正面临上述代码的问题，它没有在textarea或锚定标记的href部分显示文本，我第一次在javascript中对此感到完全困惑。

要设置

的值，请更新其“value”属性：

<html>
<head>
<script type="text/javascript">
function blz()
{
//alert("asdf");
//document.getElementById("link").innerHTML='https://www.facebook.com/dialog/feed?app_id=172099656214641&link='+encodeURI(document.getElementById("product").value)+'&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name='+encodeURI(document.getElementById("subject").value)+'&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&redirect_uri='+encodeURI(document.getElementById("redirect").value);

document.getElementById("link").innerHTML=encodeURI("https://www.facebook.com/dialog/feed?app_id=172099656214641&link="+document.getElementById("product").value+"&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name="+document.getElementById("subject").value+"&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&redirect_uri="+document.getElementById("redirect").value);

//document.getElementById('button1').href='https://www.facebook.com/dialog/feed?app_id=172099656214641&link='+encodeURI(document.getElementById("product").value)+'&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name='+encodeURI(document.getElementById("subject").value)+'&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&redirect_uri='+encodeURI(document.getElementById("redirect").value);

}
</script>
</head>
<body>
<form action="#">
subject:<input type="text" id="subject" name="subject" value="" onkeyup="return blz()" /><br/>
personal message:<input type="text" id="message" name="message" value="" onkeyup="return blz()" /><br/>
select product for recommend:<input type="text" id="product" name="product" value="" onkeyup="return blz()" /><br/>
link return:<input type="text" id="return" name="return" value="" onkeyup="return blz()" /><br/>
<textarea id="link" name="link" rows="10" cols="40" readonly></textarea><br/>
<a id="button1" href="" target="_blank"><img src="http://social.gogmat.com/components/com_referal/assets/images/bg_send.gif" alt="send button" /></a><br/>
<input type="submit" />
</form>
</body>
</html>

您需要在正在搜索的元素完成加载（onload事件，或将脚本标记放在元素的结束标记之后）后执行该函数。

文档中不存在id为“redirect”的元素。因此，这会导致javascript错误

我添加了一个缺少的元素，其值为“bleh”，以进行演示

document.getElementById("link").value = encodeURI("https://www.facebook.com/dialog/feed?app_id=172099656214641&link="+document.getElementById("product").value+"&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name="+document.getElementById("subject").value+"&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&redirect_uri="+document.getElementById("redirect").value);


函数blz（）
{
//document.getElementById（“link”）.innerHTML=https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）；
var aurl=encodeURI（“https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+document.getElementById（“产品”）.value+”&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=“+document.getElementById（“主题”）.value+”&标题=邀请%20在%20Gogmat上签出%20product%20on%20Gogmat&描述=检查%20此%20product%20on%20social.gogmat.com%20now.%0A“+document.getElementById”（“message”）.value+”&消息=检查%20此%20product%20on%20on%20social.gogmat.com%20now.%.%“+document.getElementById”（“message”）.value+”&重定向_uri=“+document.getElementById”（“重定向”）.value”）；
document.getElementById（“link”）.value=aurl；
//document.getElementById（'button1'）。href='0https://www.facebook.com/dialog/feed?app_id=172099656214641&link=“+encodeURI（document.getElementById（“产品”）.value）+”和picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name=”+encodeURI（document.getElementById（“主题”）.value）+“&caption=邀请%20在%20Gogmat上签出%20product%20%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+'&message=检查%20on%20social.gogmat.com%20now.%0A'+encodeURI（document.getElementById（“message”）.value）+重定向”+encodeURI=”（document.getElementById（“重定向”）.value）；
}
主题：

个人信息：

选择要推荐的产品：

链接返回：

另一个解决方案是从字符串中删除

document.getElementById（“redirect”）.value

。

您的想法仍然不成功。但是感谢您的回复。好的，它肯定有效，但是您还必须按照@silverstrike所说的去做，并将

块移到

的末尾，或者在onload“handler。我也尝试过你的想法，但没有得到luckHe确实有一个id为“link”的

，但它在

块之后的

中。

<html>
<head>
<script type="text/javascript">
function blz()
{

//document.getElementById("link").innerHTML='https://www.facebook.com/dialog/feed?app_id=172099656214641&link='+encodeURI(document.getElementById("product").value)+'&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name='+encodeURI(document.getElementById("subject").value)+'&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&redirect_uri='+encodeURI(document.getElementById("redirect").value);

var aurl = encodeURI("https://www.facebook.com/dialog/feed?app_id=172099656214641&link="+document.getElementById("product").value+"&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name="+document.getElementById("subject").value+"&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A"+document.getElementById("message").value+"&redirect_uri="+document.getElementById("redirect").value);
document.getElementById("link").value = aurl;

//document.getElementById('button1').href='https://www.facebook.com/dialog/feed?app_id=172099656214641&link='+encodeURI(document.getElementById("product").value)+'&picture=http%3A%2F%2Fsocial.gogmat.com%2Fimages%2Flogo_03.jpg&name='+encodeURI(document.getElementById("subject").value)+'&caption=Invitation%20to%20checkout%20product%20on%20Gogmat&description=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&message=Check%20this%20product%20on%20social.gogmat.com%20now.%0A'+encodeURI(document.getElementById("message").value)+'&redirect_uri='+encodeURI(document.getElementById("redirect").value);

}
</script>
</head>
<body>
<form action="#">
<input type="text" name="redirect" id="redirect" value="bleh" />
subject:<input type="text" id="subject" name="subject" value="" onkeyup="return blz()" /><br/>
personal message:<input type="text" id="message" name="message" value="" onkeyup="return blz()" /><br/>
select product for recommend:<input type="text" id="product" name="product" value="" onkeyup="return blz()" /><br/>
link return:<input type="text" id="return" name="return" value="" onkeyup="return blz()" /><br/>
<textarea id="link" name="link" rows="10" cols="40" readonly></textarea><br/>
<a id="button1" href="" target="_blank"><img src="http://social.gogmat.com/components/com_referal/assets/images/bg_send.gif" alt="send button" /></a><br/>
<input type="submit" />
</form>
</body>
</html>