<script> <br>function setChange() <br>{ <br>if (document.f.selfs.value == "1") <br>{ <br>document.all.tb1.style.display = "block"; <br>} <br>else <br>{ <br>document.all.tb1.style.display = "none"; <br>} <br>if (document.f.selfs.value == "2") <br>{ <br>document.all.tb2.style.display = "block"; <br>} <br>else <br>{ <br>document.all.tb2.style.display = "none"; <br>} <br>} <br></script>
判断方式也可以改为不等式










