效果图：往文本框内输入文字，按按钮可以把文本框内的文字输入到上边的单元格内
代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY >
<table border=1 width=100% id=tbl><tr><td>1</td><td>2</td></tr></table>
<input type="text" name="t1">
<input type="button" value="改变第一单元格" οnclick="tbl.rows[0].cells[0].innerText=document.all.t1.value">
<input type="button" value="改变第二单元格" οnclick="tbl.rows[0].cells[1].innerText=document.all.t1.value">
</BODY>
</HTML>
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