Flexble移动端适配方案：rem和vw

rem移动端适配方案:

第一步:在头部引入

<script src="http://g.tbcdn.cn/mtb/lib-flexible/0.3.4/??flexible_css.js,flexible.js"></script>

第二步：文字基准调整：font-size:75px

vscode里面有个插件px2rem，然后就可以正常使用了，写ｐｘ时插件会自动转换为rem
 

问题：

• rem并不适合用到段落文本上。所以在Flexible整个适配方案中，考虑文本还是使用px作为单位。只不过使用[data-dpr]属性来区分不同dpr下的文本字号大小。

div {
    width: 1rem; 
    height: 0.4rem;
    font-size: 12px; // 默认写上dpr为1的fontSize
}
[data-dpr="2"] div {
    font-size: 24px;
}
[data-dpr="3"] div {
    font-size: 36px;
}

• 为了能更好的利于开发，在实际开发中，我们可以定制一个font-dpr()这样的Sass混合宏：

@mixin font-dpr($font-size){
    font-size: $font-size;
 
    [data-dpr="2"] & {
        font-size: $font-size * 2;
    }
 
    [data-dpr="3"] & {
        font-size: $font-size * 3;
    }
}

• 有了这样的混合宏之后，在开发中可以直接这样使用：

@include font-dpr(16px);

上面那个是在线的引入,下面这个是本地引入

//flexble.js
! function(a, b) {
    function c() {
        var b = f.getBoundingClientRect().width;
        b / i > 540 && (b = 540 * i);
        var c = b / 10;
        f.style.fontSize = c + "px", k.rem = a.rem = c
    }
    var d, e = a.document,
        f = e.documentElement,
        g = e.querySelector('meta[name="viewport"]'),
        h = e.querySelector('meta[name="flexible"]'),
        i = 0,
        j = 0,
        k = b.flexible || (b.flexible = {});
    if (g) {
        console.warn("将根据已有的meta标签来设置缩放比例");
        var l = g.getAttribute("content").match(/initial\-scale=([\d\.]+)/);
        l && (j = parseFloat(l[1]), i = parseInt(1 / j))
    } else if (h) {
        var m = h.getAttribute("content");
        if (m) {
            var n = m.match(/initial\-dpr=([\d\.]+)/),
                o = m.match(/maximum\-dpr=([\d\.]+)/);
            n && (i = parseFloat(n[1]), j = parseFloat((1 / i).toFixed(2))), o && (i = parseFloat(o[1]), j = parseFloat((1 / i).toFixed(2)))
        }
    }
    if (!i && !j) {
        var p = (a.navigator.appVersion.match(/android/gi), a.navigator.appVersion.match(/iphone/gi)),
            q = a.devicePixelRatio;
        i = p ? q >= 3 && (!i || i >= 3) ? 3 : q >= 2 && (!i || i >= 2) ? 2 : 1 : 1, j = 1 / i
    }
    if (f.setAttribute("data-dpr", i), !g)
        if (g = e.createElement("meta"), g.setAttribute("name", "viewport"), g.setAttribute("content", "initial-scale=" + j + ", maximum-scale=" + j + ", minimum-scale=" + j + ", user-scalable=no"), f.firstElementChild) f.firstElementChild.appendChild(g);
        else {
            var r = e.createElement("div");
            r.appendChild(g), e.write(r.innerHTML)
        }
    a.addEventListener("resize", function() {
        clearTimeout(d), d = setTimeout(c, 300)
    }, !1), a.addEventListener("pageshow", function(a) {
        a.persisted && (clearTimeout(d), d = setTimeout(c, 300))
    }, !1), "complete" === e.readyState ? e.body.style.fontSize = 12 * i + "px" : e.addEventListener("DOMContentLoaded", function() {
        e.body.style.fontSize = 12 * i + "px"
    }, !1), c(), k.dpr = a.dpr = i, k.refreshRem = c, k.rem2px = function(a) {
        var b = parseFloat(a) * this.rem;
        return "string" == typeof a && a.match(/rem$/) && (b += "px"), b
    }, k.px2rem = function(a) {
        var b = parseFloat(a) / this.rem;
        return "string" == typeof a && a.match(/px$/) && (b += "rem"), b
    }
}(window, window.lib || (window.lib = {}));

//flexble_css.js
! function() {
    var a = "@charset \"utf-8\";html{color:#000;background:#fff;overflow-y:scroll;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}html *{outline:0;-webkit-text-size-adjust:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}html,body{font-family:sans-serif}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{margin:0;padding:0}input,select,textarea{font-size:100%}table{border-collapse:collapse;border-spacing:0}fieldset,img{border:0}abbr,acronym{border:0;font-variant:normal}del{text-decoration:line-through}address,caption,cite,code,dfn,em,th,var{font-style:normal;font-weight:500}ol,ul{list-style:none}caption,th{text-align:left}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:500}q:before,q:after{content:''}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}a:hover{text-decoration:underline}ins,a{text-decoration:none}",
        b = document.createElement("style");
    if (document.getElementsByTagName("head")[0].appendChild(b), b.styleSheet) b.styleSheet.disabled || (b.styleSheet.cssText = a);
    else try {
        b.innerHTML = a
    } catch (c) {
        b.innerText = a
    }
}();

vw移动端适配：

vscode下载px2vw，设计稿宽度设置750

• 在头部加上这个meta，然后就可以使用了

<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no" />