一、普通背景模糊

代码:

<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:

<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:

<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:

<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:

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css3实现背景模糊的三种方式(小结)