<script> function setChange() { if (document.f.selfs.value == "1") { document.all.tb1.style.display = "block"; } else { doc

<script> function setChange() { if (document.f.selfs.value == "1") { document.all.tb1.style.display = "block"; } else { document.all.tb1.style.display = "none"; } if (document.f.selfs.value == "2") { document.all.tb2.style.display = "block"; } else { document.all.tb2.style.display = "none"; } } </script> <form name=f> <select name="selfs" size="1 onchange="setChange()"> <option selected>挑选体例</option> <option value="1">体例1</option> <option value="2">体例2</option> </select> <table id='tb1' style='DISPLAY:none'>体例1</table> <table id='tb2' style='DISPLAY:none'>体例2</table> </form>

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