html怎么设置背景透明度


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示例1:

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<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8">

        <style>

            div{

                width: 300px;

                height: 200px;

                background-image: url(img/1.jpg);

                background-size: 300px;

            }

            .div1{

 

                -webkit-filter: opacity(50%); /* Chrome, Safari, Opera */

                filter: opacity(50%);

                 

            }

            .div2{

                -webkit-filter: opacity(20%); /* Chrome, Safari, Opera */

                filter: opacity(20%);

                 

            }

        </style>

    </head>

    <body>

        <div>

            <p>原图:</p>

        </div>

        <div class="div1">

            <p>透明度为50%:</p>

        </div>

        <div class="div2">

            <p>透明度为20%:</p>

        </div>

    </body>

</html>

1.png

示例2:

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<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8">

        <style>

            div{

                width: 300px;

                height: 200px;

                background-image: url(img/1.jpg);

                background-size: 300px;

            }

            .div1{

 

                opacity: 0.5;

                 

            }

            .div2{

                opacity: 0.2;

                 

            }

        </style>

    </head>

    <body>

        <div>

            <p>原图:</p>

        </div>

        <div class="div1">

            <p>透透明度为0.5:</p>

        </div>

        <div class="div2">

            <p>透明度为02:</p>

        </div>

    </body>

</html>

2.png

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