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css3实现背景模糊的三种方式

2020-05-17 | 秩名 | 点击：次

一、普通背景模糊

代码：

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<Style>
        html,
        body {
            width: 100%;
            height: 100%;
        }
 
        * {
            margin: 0;
            padding: 0;
        }
 
        /*背景模糊*/
        .bg {
            width: 100%;
            height: 100%;
            position: relative;
            background: url("./bg.jpg") no-repeat fixed;
            background-size: cover;
            box-sizing: border-box;
            filter: blur(2px);
            z-index: 1;
        }
 
        .content {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 200px;
            text-align: center;
            z-index: 2;
        }
    </Style>
</head>
 
<body>
    <div class="bg">
        <div class="content">背景模糊</div>
    </div>
</body>
 

效果如下所示：

这样写会使整个div的后代模糊并且还会出现白边，导致页面非常不美观，要想解决这个问题，我们可以使用伪元素，因为伪元素的模糊度不会被父元素的子代继承。

代码：

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<Style>
        html,
        body {
            width: 100%;
            height: 100%;
        }
 
        * {
            margin: 0;
            padding: 0;
        }
 
        /*背景模糊*/
        .bg {
            width: 100%;
            height: 100%;
            position: relative;
            background: url("./bg.jpg") no-repeat fixed;
            background-size: cover;
            box-sizing: border-box;
            z-index: 1;
        }
 
        .bg:after {
            content: "";
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0;
            top: 0;
            /* 从父元素继承 background 属性的设置 */
            background: inherit;
            filter: blur(2px);
            z-index: 2;
        }
 
 
        .content {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 200px;
            text-align: center;
            z-index: 3;
        }
    </Style>
</head>
 
<body>
    <div class="bg">
        <div class="content">背景模糊</div>
    </div>
</body>
 

效果如下所示：

二、背景局部模糊

上一个效果会了之后，局部模糊效果就比较简单了。

代码：

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<Style>
        html,
        body {
            width: 100%;
            height: 100%;
        }
 
        * {
            margin: 0;
            padding: 0;
        }
 
        /*背景模糊*/
        .bg {
            width: 100%;
            height: 100%;
            position: relative;
            background: url("./bg.jpg") no-repeat fixed;
            background-size: cover;
            box-sizing: border-box;
            z-index: 1;
        }
 
        .content {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 200px;
            background: inherit;
            z-index: 2;
        }
 
        .content:after {
            content: "";
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0;
            top: 0;
            background: inherit;
            filter: blur(15px);
            /*为了模糊更明显，调高模糊度*/
            z-index: 3;
        }
 
        .content>div {
            width: 100%;
            height: 100%;
            text-align: center;
            line-height: 200px;
            position: absolute;
            left: 0;
            top: 0;
            z-index: 4;
        }
    </Style>
</head>
 
<body>
    <div class="bg">
        <div class="content">
            <div>背景局部模糊</div>
        </div>
    </div>
</body>
 

效果如下图所示：

三、背景局部清晰

代码：

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<Style>
        html,
        body {
            width: 100%;
            height: 100%;
        }
 
        * {
            margin: 0;
            padding: 0;
        }
 
        /*背景模糊*/
        .bg {
            width: 100%;
            height: 100%;
            position: relative;
            background: url("./bg.jpg") no-repeat fixed;
            background-size: cover;
            box-sizing: border-box;
            z-index: 1;
        }
 
        .bg:after {
            content: "";
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0;
            top: 0;
            background: inherit;
            filter: blur(5px);
            z-index: 2;
        }
 
        .content {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            line-height: 200px;
            text-align: center;
            background: inherit;
            z-index: 3;
            box-shadow: 0 0 10px 6px rgba(0, 0, 0, .5);
        }
    </Style>
</head>
 
<body>
    <div class="bg">
        <div class="content">
            <div>背景局部清晰</div>
        </div>
    </div>
</body>
 

效果如下图所示：

 

原文链接：https://www.jb51.net/css/725508.html
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