<table id=table1>
<caption>asf</caption>
</table>
<script>
alert(document.getElementById("table1").caption.innerText);
</script>
<caption>asf</caption>
</table>
<script>
alert(document.getElementById("table1").caption.innerText);
</script>
调试欢乐多
<table id=table1>
<caption>asf</caption>
</table>
<script>
alert(table1.caption.innerText);
</script>