javascript - 如何使用 JavaScript 添加一些文本来发布？

Question

如何使用 javascript 在下面代码中的位置插入一些文本？感谢任何帮助，因为我仍然是 javascript 的新手。

<div class = "post-body entry-content">
<div class = "auto-thumbnail">
<table width = "500px" height = "auto" border = "0" align = "center">
<tbody>
<tr><td>
<a href = "http://www.google.com" target = "_blank"><img src = "example.jpg" border = "0"/></a><br /><br />

Author : Jason<br />
Book Title : Example Book<br />
Release Date : 2013.05.11<br /><br />
Description : <br /><br />
Here is where I want to add some text<br /><br /><!--Add text on this line-->
Hello, example....<br />
<br />
</td></tr>
</tbody>
</table>
</div>
</div>

Answer 1

放一些<p>文本周围的标签，带有 id属性，然后使用 document.getElementById()更改文本:

<p id = "textline">I want to add some text here</p><br /><br />

<script type = "text/javascript">
function changeText()
{
document.getElementById("textline").innerHTML = "changed text";
}
</script>

当您想要更改文本时，请记住调用该函数。如果能更好地描述您想要做什么以及为什么想要这样做就更好了。

编辑:

<p class = "textline">I want to add some text here</p><br /><br /><!--script will affect both lines-->
<p class = "textline">I want to add some text here</p><br /><br />
    <script type = "text/javascript">
    function changeText()
    {
    document.getElementsByClassName("textline").innerHTML = "changed text";
    }
    </script>

编辑2:

if(document.getElementById("your_id")!=null)
{
document.getElementById("your_id").innerHTML = "changed text";
}
else
{
alert("Element does not exist");
}