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<button class="tablink" onclick="openPage('Home', this, 'red')">Home</button>
<button class="tablink" onclick="openPage('News', this, 'green')" id="defaultOpen">News</button>
<button class="tablink" onclick="openPage('Contact', this, 'blue')">Contact</button>
<button class="tablink" onclick="openPage('About', this, 'orange')">About</button>

<div id="Home" class="tabcontent">
  <p>Home is where the heart is..</p>

<div id="News" class="tabcontent">
  <p>Some news this fine day!</p>

<div id="Contact" class="tabcontent">
  <p>Get in touch, or swing by for a cup of coffee.</p>

<div id="About" class="tabcontent">
  <p>Who we are and what we do.</p>


                /* 将正文和文档的高度设置为100%,以启用“整页选项卡” */
body, html {
  height: 100%;
  margin: 0;
  font-family: Arial;

/* 样式选项卡链接 */
.tablink {
  background-color: #555;
  color: white;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  font-size: 17px;
  width: 25%;

.tablink:hover {
  background-color: #777;

/* 设置选项卡内容的样式(并添加高度:全页内容为100%) */
.tabcontent {
  color: white;
  display: none;
  padding: 100px 20px;
  height: 100%;

#Home {background-color: red;}
#News {background-color: green;}
#Contact {background-color: blue;}
#About {background-color: orange;}


                function openPage(pageName, elmnt, color) {
  // 默认情况下,使用class=“tabcontent”隐藏所有元素
  var i, tabcontent, tablinks;
  tabcontent = document.getElementsByClassName("tabcontent");
  for (i = 0; i < tabcontent.length; i++) {
    tabcontent[i].style.display = "none";

  // 删除所有标签链接/按钮的背景色
  tablinks = document.getElementsByClassName("tablink");
  for (i = 0; i < tablinks.length; i++) {
    tablinks[i].style.backgroundColor = "";

  // 显示特定选项卡内容
  document.getElementById(pageName).style.display = "block";

  // 将特定颜色添加到用于打开选项卡内容的按钮 = color;

// 获取id为=“defaultOpen”的元素并单击它