我把下的有什？
<form>
<input type= "button " value= "加123 ">
</form>
<script>
word=content.innerHTML;
document.write(word+ "123 ");
</script>
<div id= "content ">
便篇文章
</div>

[解决办法]
word=content.innerHTML; //此时content div还没有加载,当然找不到出错了.
document.write(word+ "123 ");
</script>
<div id= "content ">
便篇文章
</div>