直接在圖片元素上直接應用CSS3 inset box-shadow border-radius時,流覽器並不能完美的渲染它們。不過,如果把這個圖片用作背景圖,你就可以可以給它添加任何樣式了,流覽器也會很好地渲染。Darcy Clarke和我做了一個簡單的教程,講解如何使用jQuery來動態地製作完美的圓角圖片。今天我將重溫這個主題然後向你展示使用background-image的方法可以實現多少效果。我將向你展示如何使用box-shadowborder-radius transition 來創作不同的圖片風格。

先看下demo

問題 ( demo)

看一下demo,請注意在第一行的圖片中使用了border-radiusinset box-shadowFirefox會直接在圖片元素上渲染border-radius,但不會渲染inset box-shadowchrome/safari則兩者都不渲染。

 

解決方案

要讓 border-radius inset box-shadow 正常工作,解決方案就是將實際圖片變作background-image.

 

動態方法

要想動態實現,可以簡單的使用jQuery為每個圖片元素外麵包一個背景圖片。下面的jQuery代碼會將所有圖片外麵包一個span標籤然後將圖片用作其背景圖片(jQuery代碼由Darcy Clarke編寫)

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<scripttype="text/javascript"src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
<scripttype="text/javascript">
$(document).ready(function(){
 
      $("img").load(function() {
            $(this).wrap(function(){
                  return '<spanclass="image-wrap ' + $(this).attr('class') + '"
                        style="position:relative; display:inline-block; background:url(' + $(this).attr('src') + ') no-repeat center center; width: ' + $(this).width() + 'px; height: ' + $(this).height() + 'px;"/>';
            });
            $(this).css("opacity","0");
      });
});
</script>

輸出

上面的腳本將會輸出下面的HTML代碼:

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<spanclass="image-wrap "style="position:relative; display:inline-block; background:url(image.jpg) no-repeat center center; width: 150px; height: 150px;">
      <imgsrc="image.jpg"style="opacity: 0;">
</span>

圓形圖片( demo)

現在,圖片被用作背景圖了,你可以給它添加任意你想要的樣式上去。下面是一個簡單的使用border-radius實現的圓形圖片。如果你對CSS3不太瞭解,可以閱讀下Basics of CSS3,也可以搜索一下前端觀察

 

CSS

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.circle .image-wrap {
      -webkit-border-radius: 50em;
      -moz-border-radius: 50em;
      border-radius: 50em;
}

卡片風格( demo)

下面是一個像卡片的圖片風格,用了多個inset box-shadow

 

CSS

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.card .image-wrap {
      -webkit-box-shadow: inset 0 0 1px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -1px 0 rgba(0,0,0,.4);
      -moz-box-shadow: inset 0 0 1px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -1px 0 rgba(0,0,0,.4);
      box-shadow: inset 0 0 1px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -1px 0 rgba(0,0,0,.4);
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}

浮雕風格 ( demo)

通過一點兒改變,我可以將卡片風格轉換為浮雕。。。

 

CSS

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.embossed .image-wrap {
      -webkit-box-shadow: inset 0 0 2px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -7px 0 rgba(0,0,0,.6), inset 0 -9px 0 rgba(255,255,255,.3);
      -moz-box-shadow: inset 0 0 2px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -7px 0 rgba(0,0,0,.6), inset 0 -9px 0 rgba(255,255,255,.3);
      box-shadow: inset 0 0 2px rgba(0,0,0,.8), inset 0 2px 0 rgba(255,255,255,.5), inset 0 -7px 0 rgba(0,0,0,.6), inset 0 -9px 0 rgba(255,255,255,.3);
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}

軟浮雕風格 ( demo)

和浮雕風格真的很像,我只是加了1px的虛化~~

 

CSS

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.soft-embossed .image-wrap {
      -webkit-box-shadow: inset 0 0 4px rgba(0,0,0,1), inset 0 2px 1px rgba(255,255,255,.5), inset 0 -9px 2px rgba(0,0,0,.6), inset 0 -12px 2px rgba(255,255,255,.3);
      -moz-box-shadow: inset 0 0 4px rgba(0,0,0,1), inset 0 2px 1px rgba(255,255,255,.5), inset 0 -9px 2px rgba(0,0,0,.6), inset 0 -12px 2px rgba(255,255,255,.3);
      box-shadow: inset 0 0 4px rgba(0,0,0,1), inset 0 2px 1px rgba(255,255,255,.5), inset 0 -9px 2px rgba(0,0,0,.6), inset 0 -12px 2px rgba(255,255,255,.3);
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}

剪貼畫風格( demo)

同樣只是inset box-shadow,我可以讓它看起來像剪貼畫。

 

CSS

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.cut-out .image-wrap {
      -webkit-box-shadow: 0 1px 0 rgba(255,255,255,.2), inset 0 4px 5px rgba(0,0,0,.6), inset 0 1px 0 rgba(0,0,0,.6);
      -moz-box-shadow: 0 1px 0 rgba(255,255,255,.2), inset 0 4px 5px rgba(0,0,0,.6), inset 0 1px 0 rgba(0,0,0,.6);
      box-shadow: 0 1px 0 rgba(255,255,255,.2), inset 0 4px 5px rgba(0,0,0,.6), inset 0 1px 0 rgba(0,0,0,.6);
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}

變形和發光 ( demo)

這個例子中,我為圖片外容器增加了變形。mouseover的時候,它將從圓角形狀變為圓形,然後增加了發光效果。發光效果通過多重box-shadow實現。

 

CSS

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.morphing-glowing .image-wrap {
      -webkit-transition: 1s;
      -moz-transition: 1s;
      transition: 1s;
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}
 
.morphing-glowing .image-wrap:hover {
      -webkit-box-shadow: 0 0 20px rgba(255,255,255,.6), inset 0 0 20px rgba(255,255,255,1);
      -moz-box-shadow: 0 0 20px rgba(255,255,255,.6), inset 0 0 20px rgba(255,255,255,1);
      box-shadow: 0 0 20px rgba(255,255,255,.6), inset 0 0 20px rgba(255,255,255,1);
 
      -webkit-border-radius: 60em;
      -moz-border-radius: 60em;
      border-radius: 60em;
}

發光遮罩 ( demo)

發光漸變遮罩是通過:after偽元素實現的。。。

 

CSS

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.glossy .image-wrap {
      -webkit-box-shadow: inset 0 -1px 0 rgba(0,0,0,.5);
      -moz-box-shadow: inset 0 -1px 0 rgba(0,0,0,.5);
      box-shadow: inset 0 -1px 0 rgba(0,0,0,.5);
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}
 
.glossy .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 50%;
      top: 0;
      left: 0;
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
 
      background: -moz-linear-gradient(top, rgba(255,255,255,0.7) 0%, rgba(255,255,255,.1) 100%);
      background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0.7)), color-stop(100%,rgba(255,255,255,.1)));
      background: linear-gradient(top, rgba(255,255,255,0.7) 0%,rgba(255,255,255,.1) 100%);
}

倒影 ( demo)

這個例子中,我將遮罩漸變移動到底部,於是它就成了倒影。。。

 

CSS

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.reflection .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 30px;
      bottom: -31px;
      left: 0;
 
      -webkit-border-top-left-radius: 20px;
      -webkit-border-top-right-radius: 20px;
      -moz-border-radius-topleft: 20px;
      -moz-border-radius-topright: 20px;
      border-top-left-radius: 20px;
      border-top-right-radius: 20px;
 
      background: -moz-linear-gradient(top, rgba(0,0,0,.3) 0%, rgba(255,255,255,0) 100%);
      background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,.3)), color-stop(100%,rgba(255,255,255,0)));
      background: linear-gradient(top, rgba(0,0,0,.3) 0%,rgba(255,255,255,0) 100%);
}
 
.reflection .image-wrap:hover {
      position: relative;
      top: -8px;
}

光澤和倒影( demo)

這個例子中,我同時使用了:before:after偽元素來實現帶倒影的光澤效果。

 

CSS

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.glossy-reflection .image-wrap {
      -webkit-box-shadow: inset 0 -1px 0 rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.6);
      -moz-box-shadow: inset 0 -1px 0 rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.6);
      box-shadow: inset 0 -1px 0 rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.6);
 
      -webkit-transition: 1s;
      -moz-transition: 1s;
      transition: 1s;
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}
 
.glossy-reflection .image-wrap:before {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 50%;
      top: 0;
      left: 0;
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
 
      background: -moz-linear-gradient(top, rgba(255,255,255,0.7) 0%, rgba(255,255,255,.1) 100%);
      background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0.7)), color-stop(100%,rgba(255,255,255,.1)));
      background: linear-gradient(top, rgba(255,255,255,0.7) 0%,rgba(255,255,255,.1) 100%);
}
 
.glossy-reflection .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 30px;
      bottom: -31px;
      left: 0;
 
      -webkit-border-top-left-radius: 20px;
      -webkit-border-top-right-radius: 20px;
      -moz-border-radius-topleft: 20px;
      -moz-border-radius-topright: 20px;
      border-top-left-radius: 20px;
      border-top-right-radius: 20px;
 
      background: -moz-linear-gradient(top, rgba(230,230,230,.3) 0%, rgba(230,230,230,0) 100%);
      background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(230,230,230,.3)), color-stop(100%,rgba(230,230,230,0)));
      background: linear-gradient(top, rgba(230,230,230,.3) 0%,rgba(230,230,230,0) 100%);
}

膠帶風格( demo)

這裡使用了:after偽元素來在圖片頂部實現了膠帶風格的漸變。

 

CSS

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.tape .image-wrap {
      -webkit-box-shadow: inset 0 0 2px rgba(0,0,0,.7), inset 0 2px 0 rgba(255,255,255,.3), inset 0 -1px 0 rgba(0,0,0,.5), 0 1px 3px rgba(0,0,0,.4);
      -moz-box-shadow: inset 0 0 2px rgba(0,0,0,.7), inset 0 2px 0 rgba(255,255,255,.3), inset 0 -1px 0 rgba(0,0,0,.5), 0 1px 3px rgba(0,0,0,.4);
      box-shadow: inset 0 0 2px rgba(0,0,0,.7), inset 0 2px 0 rgba(255,255,255,.3), inset 0 -1px 0 rgba(0,0,0,.5), 0 1px 3px rgba(0,0,0,.4);
}
 
.tape .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 60px;
      height: 25px;
      top: -10px;
      left: 50%;
      margin-left: -30px;
      border: solid 1px rgba(137,130,48,.2);
 
      background: -moz-linear-gradient(top, rgba(254,243,127,.6) 0%, rgba(240,224,54,.6) 100%);
      background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(254,243,127,.6)), color-stop(100%,rgba(240,224,54,.6)));
      background: linear-gradient(top, rgba(254,243,127,.6) 0%,rgba(240,224,54,.6) 100%);
      -webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,.3), 0 1px 0 rgba(0,0,0,.2);
}

變形和著色 ( demo)

在下面的這個例子中,我用了 :after元素來在mouseover的時候添加發光漸變。

 

CSS

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.morphing-tinting .image-wrap {
      position: relative;
 
      -webkit-transition: 1s;
      -moz-transition: 1s;
      transition: 1s;
 
      -webkit-border-radius: 20px;
      -moz-border-radius: 20px;
      border-radius: 20px;
}
 
.morphing-tinting .image-wrap:hover {
      -webkit-border-radius: 30em;
      -moz-border-radius: 30em;
      border-radius: 30em;
}
 
.morphing-tinting .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
 
      -webkit-transition: 1s;
      -moz-transition: 1s;
      transition: 1s;
 
      -webkit-border-radius: 30em;
      -moz-border-radius: 30em;
      border-radius: 30em;
}
.morphing-tinting .image-wrap:hover:after {
      background: -webkit-gradient(radial, 50% 50%, 40, 50% 50%, 80, from(rgba(0,0,0,0)), to(rgba(0,0,0,1)));
      background: -moz-radial-gradient(50% 50%, circle, rgba(0,0,0,0) 40px, rgba(0,0,0,1) 80px);
}

羽化邊緣的圓形(demo)

發散漸變也可以用作遮罩層來實現圓形羽化效果。

 

CSS

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.feather .image-wrap {
      position: relative;
 
      -webkit-border-radius: 30em;
      -moz-border-radius: 30em;
      border-radius: 30em;
}
 
.feather .image-wrap:after {
      position: absolute;
      content: ' ';
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
 
      background: -webkit-gradient(radial, 50% 50%, 50, 50% 50%, 70, from(rgba(255,255,255,0)), to(rgba(255,255,255,1)));
      background: -moz-radial-gradient(50% 50%, circle, rgba(255,255,255,0) 50px, rgba(255,255,255,1) 70px);

瀏覽器支持

本文的方法可以在支援border-radiusbox-shadow:before:after偽元素的流覽器上,比如 Chrome/Safari/Firefox等,而在一些落後的瀏覽器比如IE9(包括IE9)則不能完全支持——IE6/7/8沒有任何表現,IE9會 有普通的圓角。

文章來自:: 前端觀察

文章提供:: BAYSTARS DESIGN網頁設計公司

 

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