将下面的代码加在<body></body>之间
<input type="button" value="隐藏" onclick="csan(did,'none')"><input type="button" value="显示" onclick="csan(did,'')"><input id="did"><br><input type="button" value="隐藏" onclick="csan(dis,'none')"><input type="button" value="显示" onclick="csan(dis,'')"><input id="dis">
<script>
function csan(obj,sta){eval("obj.style.display=\""+sta+"\"");}
</script>