在台式机上使用1个内部图片，在移动设备上使用另一个图片？
[英]Use 1 internal image for desktop and a different one for mobile?
问题描述
I have a in which I have defined it to have a background.svg graphic in css. 
我有一个我已经定义它在css中有background.svg图形。 Now I want to use background.svg for desktop screens and a different one named backgroundm.svg for mobile screens. 现在，我想将background.svg用于桌面屏幕，将另一个名称为backgroundm.svg用于移动屏幕。 Is this even possible like this through css or do I have to do it differently from what I'm trying to do ? 这样甚至可能通过css来实现吗？还是我必须与尝试做的事情不同？ Thanks! 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">© DA COSTA JOAO (2019)</div> </footer> </body> </html>
2 个解决方案
解决方案1
0 2019-02-28 01:12:58
Use the @media tag to change the image source depending on the screen width. 使用@media标签可根据屏幕宽度更改图像源。 When it comes to page responsiveness (especially for mobile), it is generally considered best practice to avoid using JavaScript when possible. 当涉及到页面响应性时（尤其是对于移动设备），通常被认为是最佳实践，那就是尽可能避免使用JavaScript。
.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 (min-width: 600px){
.header {
background-image: url(img/johnswork.svg);
}
}
For more information, check out https://www.w3schools.com/cssref/css3_pr_mediaquery.asp 有关更多信息，请访问https://www.w3schools.com/cssref/css3_pr_mediaquery.asp
解决方案2
0 已采纳 2019-02-28 01:17:01
You can use media queries to "detect" the dimensions of a mobile and then display the new image: 您可以使用媒体查询来“检测”移动设备的尺寸，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");
}
}
The media query: 媒体查询：
@media (max-width: 768px) {
}
will apply the styles within it when the screen size is less than 768px. 当屏幕尺寸小于768像素时，将应用其中的样式。 Thus, it's not the best approach to detect mobile screen sizes. 因此，这不是检测移动屏幕尺寸的最佳方法。 You can find a concise list of media queries for detecting particular devices here . 您可以在此处找到简要的媒体查询列表，以检测特定设备。
Alternatively, you could use javascript to do user agent sniffing, allowing you to detect if the end-user is using a mobile. 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正在使用手机。 (this isn't a recommended approach): （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
})
}
});
Credit to this answer for mobile detection function. 将此答案归功于移动检测功能。
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