如何操作 - 即将推出页面

了解如何使用 CSS 和 JavaScript 创建"coming soon page"。

如何创建即将推出的页面

步骤1）添加HTML：

在我们的示例中，我们将使用覆盖整个页面的背景图片，并在图片中放置一些文本，让用户知道发生了什么。

此示例展示了如何仅使用 HTML 和 CSS 创建"Coming Soon Page"。请参阅下一个示例，了解如何使用 JavaScript 添加"countdown timer"。

示例

<div class="bgimg">
<div class="topleft">
    <p>Logo</p>
</div>
<div class="middle">
    <h1>COMING SOON</h1>
    <hr>
    <p>35 days</p>
</div>
<div class="bottomleft">
    <p>Some text</p>
</div>
</div>

步骤2）添加CSS：

示例

/* Set height to 100% for body and html to enable the background image to cover the whole page: */
body, html {
  height: 100%
}

.bgimg {
/* Background image */
background-image: url('/w3images/forestbridge.jpg');
/* Full-screen */
height: 100%;
/* Center the background image */
background-position: center;
/* Scale and zoom in the image */
  background-size: cover;
/* Add position: relative to enable absolutely positioned elements inside the image (place text) */
position: relative;
  /* Add a white text color to all elements inside the .bgimg container */
color: white;
/* Add a font */
font-family: "Courier New", Courier, monospace;
/* Set the font-size to 25 pixels */
font-size: 25px;
}

/* Position text in the top-left corner */
.topleft {
position: absolute;
top: 0;
left: 16px;
}

/* Position text in the bottom-left corner */
.bottomleft {
position: absolute;
bottom: 0;
  left: 16px;
}

/* Position text in the middle */
.middle {
  position: absolute;
  top: 50%;
left: 50%;
transform: translate(-50%, -50%);
  text-align: center;
}

/* Style the <hr> element */
hr {
margin: auto;
width: 40%;
}

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步骤 3) 添加 JavaScript

添加 JavaScript 以创建倒计时器：

示例

// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2024 15:37:25").getTime();

// Update the count down every 1 second
var x = setInterval(function() {

// Get todays date and time
var now = new Date().getTime();

// Find the distance between now an the count down date
var distance = countDownDate - now;

// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);

// Display the result in an element with id="demo"
document.getElementById("demo").innerHTML = days + "d " + hours + "h "
+ minutes + "m " + seconds + "s ";

// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);

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