使用rem編寫自適應屏幕網頁形成div被span撐高的解決辦法

時間 2019-12-07

標籤使用 rem 編寫自適應屏幕網頁形成 div span 高的解決辦法欄目 CSS 简体版

原文原文鏈接

原始代碼：javascript

<html>
<head>
    <meta charset="utf-8">
    <meta content="ie=edge" http-equiv="x-ua-compatible">
    <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=0" />
</head>    
<style type="text/css">
    #content{
        width:7.2rem
    }

    .price-div{
      background-color:yellow;
    }

    .price-div span{
      background-color:green;
    }    

    .price-unit{
        font-size:0.25rem;
    }

    .price-number{
        font-size:0.31rem;
    }
</style>
<body>
<div id="content" style="float:left">
    <div class="price-div" >
        <span class="price-unit">￥</span>
        <span  class="price-number">42</span>
    </div>
</div>

<script type="text/javascript">
    //計算字體大小
    var calculateFontSize = function () {
        var BASE_FONT_SIZE = 100;

        var docEl = document.documentElement,
                clientWidth = docEl.clientWidth;
        if (!clientWidth) return;
        docEl.style.fontSize = BASE_FONT_SIZE * (clientWidth / 720) + 'px';

    };
    calculateFontSize();

    // Abort if browser does not support addEventListener
    if (document.addEventListener) {
        var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
        window.addEventListener(resizeEvt, calculateFontSize, false);
        document.addEventListener('DOMContentLoaded', calculateFontSize, false);
    }

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

效果：css

緣由：html

rem縮放，致使，去掉縮放的js代碼就行了。但這個不是解決辦法。java

解決方法一：字體

div設置高度並採用相對定位,span採用絕對定位。ui

<style type="text/css">
    #content{
        width:7.2rem
    }

    .price-div{
      background-color:yellow;
      height:0.4rem;
      line-height:0.4rem;
      position:relative;
    }

    .price-div span{
      background-color:green;
    }    

    .price-unit{
        font-size:0.25rem;
        position:absolute;
        top:0rem;
        left:0.2rem;
    }

    .price-number{
        font-size:0.31rem;
        position:absolute;
        top:0rem;
        left:0.5rem;
    }
</style>

效果：spa

解決方法二：scala

div設置高度，span等內聯元素設置vertical-align爲top。code

<style type="text/css">
    #content{
        width:7.2rem
    }

    .price-div{
      background-color:yellow;
      height:0.4rem;
      line-height:0.4rem;
    }

    .price-div span{
      background-color:green;
    }    

    .price-unit{
        font-size:0.25rem;
        vertical-align:top;
    }

    .price-number{
        font-size:0.31rem;
        vertical-align:top;
    }
</style>