您可以模糊 div 下方/后面的内容吗？ [复制]

Question

我现在正在 Photoshop 中创建一个新的网页设计，但我想知道是否可以模糊 div 下的内容？

我想在我的页面上创建一个半透明的nav 栏，它固定在屏幕顶部。在下面/后面流动的一切，我想模糊。对于那些拥有 iOS 7 的 iDevice 的人，请查看 Safari 的标题；页眉下方的页面模糊不清的地方。这就是我想要的效果。

我不介意这种效果不适用于旧版浏览器（IE8 等），在这种情况下，它会使用 0.5 不透明度的白色背景作为后备。

如果可以的话，我真的在寻找必要的代码！

Answer 1

如果你想启用 unblur，你不能只在 body 中添加 blur CSS，你需要在 body 的正下方模糊每个可见子级，然后删除 CSS 以取消模糊。原因是由于 CSS 中的“级联”，您无法撤消 CSS 模糊效果对 body 子级的级联。此外，要模糊身体的背景图像，您需要使用伪元素 :before

//HTML

<div id="fullscreen-popup" style="position:absolute;top:50%;left:50%;">
    <div class="morph-button morph-button-overlay morph-button-fixed">
        <button id="user-interface" type="button">MORE INFO</button>
        <!--a id="user-interface" href="javascript:void(0)">popup</a-->
        <div class="morph-content">
            <div>
                <div class="content-style-overlay">
                    <span class="icon icon-close">Close the overlay</span>
                    <h2>About Parsley</h2>
                    <p>Gumbo beet greens corn soko endive gumbo gourd. Parsley shallot courgette tatsoi pea sprouts fava bean collard greens dandelion okra wakame tomato. Dandelion cucumber earthnut pea peanut soko zucchini.</p>
                    <p>Turnip greens yarrow ricebean rutabaga endive cauliflower sea lettuce kohlrabi amaranth water spinach avocado daikon napa cabbage asparagus winter purslane kale. Celery potato scallion desert raisin horseradish spinach carrot soko. Lotus root water spinach fennel kombu maize bamboo shoot green bean swiss chard seakale pumpkin onion chickpea gram corn pea. Brussels sprout coriander water chestnut gourd swiss chard wakame kohlrabi beetroot carrot watercress. Corn amaranth salsify bunya nuts nori azuki bean chickweed potato bell pepper artichoke.</p>
                    <p>Gumbo beet greens corn soko endive gumbo gourd. Parsley shallot courgette tatsoi pea sprouts fava bean collard greens dandelion okra wakame tomato. Dandelion cucumber earthnut pea peanut soko zucchini.</p>
                    <p>Turnip greens yarrow ricebean rutabaga endive cauliflower sea lettuce kohlrabi amaranth water spinach avocado daikon napa cabbage asparagus winter purslane kale. Celery potato scallion desert raisin horseradish spinach carrot soko. Lotus root water spinach fennel kombu maize bamboo shoot green bean swiss chard seakale pumpkin onion chickpea gram corn pea. Brussels sprout coriander water chestnut gourd swiss chard wakame kohlrabi beetroot carrot watercress. Corn amaranth salsify bunya nuts nori azuki bean chickweed potato bell pepper artichoke.</p>
                    <p>Gumbo beet greens corn soko endive gumbo gourd. Parsley shallot courgette tatsoi pea sprouts fava bean collard greens dandelion okra wakame tomato. Dandelion cucumber earthnut pea peanut soko zucchini.</p>
                    <p>Turnip greens yarrow ricebean rutabaga endive cauliflower sea lettuce kohlrabi amaranth water spinach avocado daikon napa cabbage asparagus winter purslane kale. Celery potato scallion desert raisin horseradish spinach carrot soko. Lotus root water spinach fennel kombu maize bamboo shoot green bean swiss chard seakale pumpkin onion chickpea gram corn pea. Brussels sprout coriander water chestnut gourd swiss chard wakame kohlrabi beetroot carrot watercress. Corn amaranth salsify bunya nuts nori azuki bean chickweed potato bell pepper artichoke.</p>
                </div>
            </div>
        </div>
    </div>
</div>

//CSS

/* Blur - doesn't work on IE */

.blur-on, .blur-element {
    -webkit-filter: blur(10px);
    -moz-filter: blur(10px);
    -o-filter: blur(10px);
    -ms-filter: blur(10px);
    filter: blur(10px);

    -webkit-transition: all 5s linear;
    transition        : all 5s linear;
    -moz-transition   : all 5s linear;
    -webkit-transition: all 5s linear;
    -o-transition     : all 5s linear;
}
.blur-off {
    -webkit-filter: blur(0px) !important;
    -moz-filter   : blur(0px) !important;
    -o-filter     : blur(0px) !important;
    -ms-filter    : blur(0px) !important;
    filter        : blur(0px) !important;
}
.blur-bgimage:before {
    content: "";
    position: absolute;
    height: 20%; width: 20%;
    background-size: cover;
    background: inherit;
    z-index: -1;

    transform: scale(5);
    transform-origin: top left;
    filter: blur(2px);       
    -moz-transform: scale(5);
    -moz-transform-origin: top left;
    -moz-filter: blur(2px);       
    -webkit-transform: scale(5);
    -webkit-transform-origin: top left;
    -webkit-filter: blur(2px);
    -o-transform: scale(5);
    -o-transform-origin: top left;
    -o-filter: blur(2px);       

    transition        : all 5s linear;
    -moz-transition   : all 5s linear;
    -webkit-transition: all 5s linear;
    -o-transition     : all 5s linear;
}


//Javascript

function blurBehindPopup() {
    if(blurredElements.length == 0) {
        for(var i=0; i < document.body.children.length; i++) {
            var element = document.body.children[i];
            if(element.id && element.id != 'fullscreen-popup' && element.isVisible == true) {
                classie.addClass( element, 'blur-element' );
                blurredElements.push(element);
            }
        }
    } else {
        for(var i=0; i < blurredElements.length; i++) {
            classie.addClass( blurredElements[i], 'blur-element' );
        }
    }
}
function unblurBehindPopup() {
    for(var i=0; i < blurredElements.length; i++) {
        classie.removeClass( blurredElements[i], 'blur-element' );
    }
}

Full Working Example Link

Answer 2

你可以用 css3 做到这一点，这会模糊整个元素

div (or whatever element) {
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}

小提琴：http://jsfiddle.net/H4DU4/