关于引导崩溃的问题及其对 DOM 的影响

Question

我在我的网页中使用引导程序。现在我想实现一个特定的效果。我有一个类名为“container-fluid”的 div 和一个带有文本的 h2 标签。就像下面这样：

<div class="container-fluid" style="background-color: #f8f8f8;text-align: center;height: 76px;">
    <br>
    <h2 id="mesheading" style="color: #a76281; font-size: 14px; cursor: pointer; margin-top: -4px; font-family: 'brandon_grotesquebold'; text-transform: uppercase; letter-spacing: 2px;">
        Helping manufacturers save 20%-30% of the store cost &nbsp;
        <span>
            <button class="button_one" type="button" onclick="open_win_two()">
                LEARN MORE
            </button>
        </span>
    </h2><br>
</div>

我的要求是当浏览器窗口折叠时，h2标签的字体大小会变小。例如它将变为 10px。

在浏览器窗口按实际大小展开时，它会变回原来的字体大小，即 14 像素

我对jQuery的崩溃相关事件做了很多研究。但这对我没有帮助。

所以请帮助我实现这一目标。

提前致谢！！！

Answer 1

您应该像这样使用媒体查询的默认断点：

CSS

/* Extra Small Devices, Phones */ 
  @media only screen and (min-width : 480px) {
    .container-fluid h2 {
      your font size
      }
    }

/* Small Devices, Tablets */
  @media only screen and (min-width : 768px) {
    .container-fluid h2 {
      font-size: 10px;
    }
  }

/* Medium Devices, Desktops */
  @media only screen and (min-width : 992px) {
    .container-fluid h2 {
      your font size
    }
   }

/* Large Devices, Wide Screens */
  @media only screen and (min-width : 1200px) {
     .container-fluid h2 {
        your font size
    }
  }

Answer 2

问题

根据屏幕大小更改元素的 css。

解决方案

您可以使用媒体查询来更改h2 或任何元素的字体大小。

示例

使用此媒体查询为您在查询中提供的两个宽度之间的任何内容设置条件。您可以通过更改min 和max width 的宽度来重复使用它来创建多个场景。

 @media only screen and (min-device-width: 481px) and (max-device-width: 1024px) {
      .container-fluid h2 {
         font-size: 10px;
}
    }

然后，在媒体查询之外，对于不属于您的任何media queries 条件的任何内容，您都可以默认执行此操作。

.container-fluid h2 {
    font-size: 14px;
}

定位特定设备

以下是针对流行设备的一些更常见的必要媒体查询。

/* Smartphones (portrait and landscape) ----------- */
@media only screen and (min-device-width : 320px) and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) ----------- */
@media only screen and (min-width : 321px) {
/* Styles */
}

/* Smartphones (portrait) ----------- */
@media only screen and (max-width : 320px) {
/* Styles */
}

/* iPads (portrait and landscape) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) {
/* Styles */
}

/* iPads (landscape) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) {
/* Styles */
}

/* iPads (portrait) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) {
/* Styles */
}
/**********
iPad 3
**********/
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}
/* Desktops and laptops ----------- */
@media only screen  and (min-width : 1224px) {
/* Styles */
}

/* Large screens ----------- */
@media only screen  and (min-width : 1824px) {
/* Styles */
}

/* iPhone 4 ----------- */
@media only screen and (min-device-width : 320px) and (max-device-width : 480px) and (orientation : landscape) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) and (orientation : portrait) and (-webkit-min-device-pixel-ratio : 2) {
/* Styles */
}

/* iPhone 5 ----------- */
@media only screen and (min-device-width: 320px) and (max-device-height: 568px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 568px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* iPhone 6 ----------- */
@media only screen and (min-device-width: 375px) and (max-device-height: 667px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 375px) and (max-device-height: 667px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* iPhone 6+ ----------- */
@media only screen and (min-device-width: 414px) and (max-device-height: 736px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 414px) and (max-device-height: 736px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* Samsung Galaxy S3 ----------- */
@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 2){
/* Styles */
}

/* Samsung Galaxy S4 ----------- */
@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

@media only screen and (min-device-width: 320px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

/* Samsung Galaxy S5 ----------- */
@media only screen and (min-device-width: 360px) and (max-device-height: 640px) and (orientation : landscape) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}

@media only screen and (min-device-width: 360px) and (max-device-height: 640px) and (orientation : portrait) and (-webkit-device-pixel-ratio: 3){
/* Styles */
}