17.css 变量 

<html>
    <head>
        <meta charset="UTF-8">
        <title>css</title>
        <style type="text/css">
            :root{
                --color:red;
                --background-color: { 
                    background-color: color(#fff shade(+80%)); 
                }
            }
            .css-v{
                
                color: var(--color);
                @apply --background-color;
            }
        </style>
    </head>
    <body>
        <div class="css-v">
            -------aspect-ratio-boxes-------
        </div>
        <div class="">
            <input type="button" name="" id="button" value="1111111111" />
        </div>
        <script type="text/javascript">
            window.onload = function(){
                function setColor() { 
                    let color = 'blue'; 
                    // codes to update loadProgress here 
                    return color;
                }
                document.getElementById('button').onclick = function(){
                    document.documentElement.style.setProperty('--color', setColor())
                }
            }
            
                // Set width of progress bar
            

        </script>
    </body>
</html>

 

posted @ 2017-07-25 10:36  famCc  阅读(166)  评论(0)    收藏  举报