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javascript - 为桌面使用 1 个内部图像,为移动设备使用不同的内部图像?

转载 作者:行者123 更新时间:2023-11-28 00:19:59 25 4
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我有一个,我在其中将其定义为在 css 中具有 background.svg 图形。现在我想为桌面屏幕使用 background.svg,为移动屏幕使用另一个名为 backgroundm.svg 的文件。这甚至可以通过 css 这样做,还是我必须以不同于我正在尝试做的方式来做?谢谢!

.header {
background-image: url(img/johnswork.svg);
background-repeat: no-repeat;
background-size: 100% 100%;
height: 100%;
width: 100%;
margin-top: 10%;
margin-bottom: 10%;
}
<!DOCTYPE html>

<html lang="en-US">

<head>>
</head>

<body>
<nav class="navbar">
<ul>
<li><a href="index.html">HOME</a></li>
<li><a href="about.html">ABOUT</a></li>
<li><a href="contact.html">CONTACT</a></li>
</ul>
</nav>

<header class="header">

</header>

<section class="body">
<section class="content">
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla ac ipsum non diam faucibus dignissim. Praesent a dolor tincidunt, rutrum diam ut, convallis orci.
</section>
</section>

<footer class="footer" id="copyright" style="text-align:center">
<div id="cpy">&copy; DA COSTA JOAO (2019)</div>
</footer>

</body>

</html>

最佳答案

您可以使用 media queries “检测”手机的尺寸然后显示新图像:

.header {
background-image: url("img/johnswork.svg");
background-repeat: no-repeat;
background-size: 100% 100%;
height: 100%;
width: 100%;
margin-top: 10%;
margin-bottom: 10%;
}

@media (max-width: 768px) { /* when screen size is < 768px apply the following styles */
.header {
background-image: url("img/johnswork-mobile.svg");
}
}

媒体查询:

@media (max-width: 768px) {

}

将在屏幕尺寸小于 768px 时应用其中的样式。因此,它不是检测手机屏幕尺寸的最佳方法。您可以找到用于检测特定设备的媒体查询简明列表 here .

或者,您可以使用 javascript 进行用户代理嗅探,从而检测最终用户是否在使用手机。 (这不是推荐的方法):

function isMobile() {
var check = false;
(function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4))) check = true;})(navigator.userAgent||navigator.vendor||window.opera);
return check;
};

window.addEventListener('DOMContentLoaded', function() { // when DOM has loaded
if(isMobile()) { // Check if UA is mobile, if it is, then:
[...document.getElementsByClassName("header")].forEach(elem => { // get all elements with the class "header" and loop through them, at each iteration:
elem.style.backgroundImage = "url('img/johnswork-mobile.svg')"; // change the elements background image style
})
}
});

归功于 this answer用于移动检测功能。

关于javascript - 为桌面使用 1 个内部图像,为移动设备使用不同的内部图像?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54916832/

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