怎么实现按钮控制页面是否显示
1、<input type=text id="hd" name="h颊俄岿髭d" value="hello world"><input type=text id="nh" name="nh" value="您好"><input type = "button" value="替换按钮" onclick="changeName();"/><javascript> function changeName(){ var changeVal = document.getElementById("nh").value; var hdVal = document.getElementById("nh").value; document.getElementById("hd").value = hdVal+changeVal; } </javascript>
2、首先，设置在网页中显示文本的格式，文本的高度为100像素，宽度为280像素。定义显示文本的字体大小为22像素，离左侧和右侧的距离设置为自动，离顶部的距离设置为15像素。
3、在子页面b用 "opener.location.href="c.html" 控制a页面跳转到c页面其中a页面为：点击按钮a，打开新窗口b，验证码的存在可在b代码中添加指令，使b点击按钮等后让a页面刷新（暂时没写）。
4、<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN媪青怍牙" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title></head><script language="javascript" type="text/javascript">var code ;function createCode(){ code = new Array();var codeLength = 4;var checkCode = document.getElementById("checkCode"); checkCode.value = "";var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');for(var i=0;i<codeLength;i++) {var charIndex = Math.floor(Math.random()*32); code +=selectChar[charIndex]; } checkCode.value = code; }</script><script>function a(){var openUrl = "b.html";//弹出窗口的urlvar iWidth=580; //弹出窗口的宽度;var iHeight=580; //弹出窗口的高度;var iTop = (window.screen.availHeight-30-iHeight)/2; //获得窗口的垂直位置;var iLeft = (window.screen.availWidth-10-iWidth)/2; //获得窗口的水平位置;window.open(openUrl,"","height="+iHeight+", width="+iWidth+", top="+iTop+", left="+iLeft); }</script><script>function a2(){window.location.href="c.html"}</script><body onLoad="createCode();"><input type="button" id="Button1" onClick="a();" value="a" /><input type="button" id="checkCode" onClick="createCode()" title="刷新验证码" style="width:50px;color:#F00;border:0;letter-spacing:1px;font-family:Arial;" /></body></html>
