网页响应式媒体查询代码

原生实现rem响应式

<!DOCTYPE html>
<html style="font-size: 100px">
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"/>
    <title></title>
    <script>
        /*让文字和标签的大小随着屏幕的尺寸做变话 等比缩放*/
        var html = document.getElementsByTagName('html')[0];
        console.log(html);
        /*取到屏幕的宽度*/
        var width = window.innerWidth;
        console.log(width);
        /* 640 100  320 50 */
        var fontSize = 100/640*width;

        
        console.log(fontSize);
        /*设置fontsize*/

        html.style.fontSize = fontSize +'px';
        window.onresize = function(){
            var html = document.getElementsByTagName('html')[0];
            console.log(html);
            /*取到屏幕的宽度*/
            var width = window.innerWidth;
            console.log(width);
            /* 640 100  320 50 */
            var fontSize = 100/640 * width;
            console.log(fontSize);
            /*设置fontsize*/
            html.style.fontSize = fontSize +'px';

        }
    </script>
    <style>
        body,html{
            margin: 0;
            padding : 0;
        }
        div{
            width: 5.28rem;
            height: 1rem;
            background: red;
            color: #fff;
            font-size: 0.16rem;
        }



    </style>
</head>
<body>
    <div>AAA</div>
</body>
</html>

jq实现rem响应式

$(function(){
    $(window).on('resize',function(){
        var width=$(window).width();
        var fontSize=(width/640)*100;
        $('html').css('font-size',fontSize)
    }).trigger('resize')
})

网页响应式媒体查询代码

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