如图，制作一个bootstrap，想在小屏幕时背景图片不存在怎么办？

Answer 1

你可通过 media query 在小屏幕时，去年背景。

Answer 2

具体写法如下 打个比方

<div class="background">

<div/>

这个是你要让他消失的 背景图

 你想让它在800px左右 背景图片消失 

@media only screen and (max-width: 800px) { 

        .background{

background: none ;

    }

}

Answer 3

wesrdtkyu

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https://www.sordum.org/?s=%E7%8E%A9%E5%85%B7%E6%B0%94%E5%BC%B9%E6%9E%AA%E7%BD%91%E7%AB%99%E5%87%BA%E5%94%AE%E9%AB%98%E5%8E%8B%E6%8A%A2%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%64%79
https://www.chunyuyisheng.com/pc/search/qalist/?query=%35%34%36%34%E5%BC%8F%E5%90%84%E8%A3%85%E5%87%A0%E5%8F%91%E5%AD%90%E5%BC%B9%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%6B
https://www.sordum.org/?s=%E7%8E%A9%E5%85%B7%E7%89%88%E5%85%A8%E8%87%AA%E5%8A%A8%E6%B2%99%E6%BC%A0%E4%B9%8B%E9%B9%B0%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%72%73
https://www.chunyuyisheng.com/pc/search/qalist/?query=%35%2E%35%E6%9D%BF%E7%90%83%E6%A0%A1%E5%A4%9A%E5%B0%91%E7%B1%B3%E8%A1%8C%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%6F
https://www.sordum.org/?s=%E5%B0%8F%E5%8F%A3%E5%BE%84%E8%BF%90%E5%8A%A8%E6%AD%A5%E6%9E%AA%E5%BC%B9%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%78
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E9%BB%91%E5%B8%82%E5%AD%90%E5%BC%B9%E5%A4%9A%E9%92%B1%E4%B8%80%E9%A2%97%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%6D
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E6%9D%BF%E7%90%83%E5%A5%BD%E8%BF%98%E6%98%AF%E7%A7%83%E5%A5%BD%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%76%61
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E9%BB%91%E5%B8%82%E8%83%BD%E4%B9%B0%E5%88%B0%E4%BA%94%E8%BF%9E%E5%8F%91%E4%B9%88%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%62
https://www.sordum.org/?s=%E7%A7%83%E5%AD%90%E8%B7%9F%42%35%30%E5%93%AA%E4%B8%AA%E5%A5%BD%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%63
https://www.chunyuyisheng.com/pc/search/qalist/?query=%36%2E%33%35%E5%8F%A3%E5%BE%84%E5%87%A0%E6%9D%A1%E8%86%9B%E7%BA%BF%E5%90%88%E9%80%82%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%71
https://www.sordum.org/?s=%E5%85%A8%E8%87%AA%E5%8A%A8%70%63%70%E5%AD%A3%E5%80%99%E9%A3%8E%66%78%E5%AD%A3%E5%80%99%E9%A3%8E%70%63%70%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%7A
https://www.chunyuyisheng.com/pc/search/qalist/?query=%36%2E%33%35%E6%9D%BF%E7%90%83%E5%8E%9F%E8%A3%85%E6%9D%BF%E7%90%83%E5%9B%BE%E7%89%87%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%62
https://www.sordum.org/?s=%E7%BE%8E%E7%89%88%E6%88%98%E6%9C%AF%50%43%E5%9B%BE%E7%89%87%E6%AC%A3%E8%B5%8F%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%71%72
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E4%BF%84%E7%BD%97%E6%96%AF%E6%8A%98%E5%8F%A0%E4%B8%BD%E8%AF%97%70%63%70%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%61%6A
https://www.sordum.org/?s=%39%32%E5%BC%8F%E6%89%8B%E6%80%86%E6%80%A7%E8%83%BD%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%79%61
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E6%AD%A3%E5%93%81%E5%8F%B0%E6%B9%BE%E9%92%A2%E7%82%AE%E7%AE%A1%E5%9B%BE%E6%A0%87%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%68
https://www.sordum.org/?s=%E7%A7%83%E5%AD%90%35%2E%35%E5%92%8C%36%2E%33%35%E9%82%A3%E7%A7%8D%E5%A5%BD%E7%94%A8%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%73
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E7%A7%83%E5%AD%90%E4%B8%8A%E5%BC%B9%E7%9A%84%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%78
https://www.sordum.org/?s=%E5%85%B3%E4%BA%8E%E7%A7%83%E5%AD%90%E9%B9%B0%E6%80%8E%E4%B9%88%E4%B8%8A%E5%BC%B9%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%64%6E
https://www.sordum.org/?s=%35%2E%36%E5%B0%8F%E5%8F%A3%E5%BE%84%E5%BC%B9%E5%A4%B4%E6%A8%A1%E5%85%B7%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%61
https://www.sordum.org/?s=%E6%88%98%E6%9C%AF%50%43%E5%88%86%E8%A7%A3%E5%9B%BE%E6%88%98%E6%9C%AF%50%43%E6%8F%A1%E6%8A%8A%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%6F%64
https://www.sordum.org/?s=%E6%88%98%E6%9C%AF%50%43%E7%BB%84%E8%A3%85%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%79%6C
https://www.sordum.org/?s=%36%34%35%E9%85%8D%E4%BB%B6%E6%B7%98%E5%AE%9D%E4%B8%8A%E6%80%8E%E4%B9%88%E6%89%BE%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%67
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E6%89%93%E7%8C%8E%E5%B7%A5%E5%85%B7%E5%8F%8A%E4%BB%B7%E6%A0%BC%E6%89%93%E7%8C%8E%E5%B7%A5%E5%85%B7%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%79%67
https://www.sordum.org/?s=%E6%88%98%E6%9C%AF%50%43%E6%9E%AA%E5%9B%BE%E7%89%87%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%72
https://www.chunyuyisheng.com/pc/search/qalist/?query=%45%44%E6%9D%BF%E7%90%83%E5%BC%B9%E8%BD%AE%E5%8A%A8%E6%80%81%E7%BB%93%E6%9E%84%E5%9B%BE%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%73
https://www.sordum.org/?s=%35%35%E9%93%85%E5%BC%B9%E6%98%AF%E5%A4%9A%E5%B0%91%E5%85%8B%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%69
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E6%88%B7%E5%A4%96%E6%89%93%E7%8C%8E%E8%A3%85%E5%A4%87%E6%9E%AA%E6%94%AF%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%72%66
https://www.sordum.org/?s=%E6%B0%94%E7%8B%99%E5%87%BB%E6%AD%A5%E6%9E%AA%E5%95%86%E5%BA%97%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%66
https://www.chunyuyisheng.com/pc/search/qalist/?query=%35%2E%35%E7%9A%84%E6%A8%A1%E5%85%B7%E7%94%A8%E5%A4%9A%E7%B2%97%E7%9A%84%E9%93%85%E4%B8%9D%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%68
https://www.sordum.org/?s=%E6%B0%94%E5%8A%A8%31%39%31%31%E5%A8%81%E5%8A%9B%E5%A6%82%E4%BD%95%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%63
https://www.chunyuyisheng.com/pc/search/qalist/?query=%E5%85%A8%E9%92%A2%E5%B0%8F%E5%BC%A9%E9%9C%B8%E7%9A%84%E4%BB%B7%E6%A0%BC%5F%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%79%76
https://www.sordum.org/?s=%34%20%2E%20%35%20%E6%81%92%E5%8E%8B%E5%A4%9A%E5%B0%91%E5%90%88%E9%80%82%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%68%76
https://www.sordum.org/?s=%E6%B0%94%E7%93%B6%E6%9E%AA%E6%9E%84%E9%80%A0%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%6B%70
https://www.sordum.org/?s=%E6%89%8B%E6%8B%89%E6%9C%BA%E8%83%BD%E7%88%86%E7%93%B6%E8%83%BD%E6%89%93%E9%B8%9F%E5%90%97%E3%80%8E%EF%BC%96%D0%A7%EF%BC%99%EF%BC%99%2D%EF%BC%95%D0%97%D0%97%6C%E3%80%8F%51%2E%2E%62

Answer 4

你可通过 media query 在小屏幕时，去年背景。

Answer 5

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