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qdh.flexible

v0.3.3

Published

来自淘宝的移动端自适应方案,做了大屏幕适配

Downloads

4

Readme

#lib.flexible

移动端自适应方案

最新版本

0.3.2

用Grunt打包

运行 npm install,来安装所需的依赖模块。关于NPM的知识,请参见nodejs;

运行 grunt,来对项目进行打包。关于Grunt的知识,请参见gruntjs;

依赖库

完整引用举例:

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

使用方法

建议对于js做内敛处理,在所有资源加载之前执行这个js。

执行这个js后,会在html(也就是document.documentElement)上增加一个data-dpr属性,以及font-size样式。

之后页面中的元素,都可以用rem单位来设置。html上的font-size就是rem的基准像素。

把视觉稿中的px转换成rem

首先,目前视觉稿大小分为640750以及,1125这三种。

当前方案会把这3类视觉稿分成100份来看待(为了以后兼容vh,vw单位)。每一份被称为一个单位a。同时,1rem单位认定为10a。拿750的视觉稿举例:

1a = 7.5px
1rem = 75px

因此,对于视觉稿上的元素的尺寸换算,只需要原始px值除以rem基准px值即可。例如240px * 120px的元素,最后转换为3.2rem * 1.6rem。

字体不使用rem的方法

字体的大小不推荐用rem作为单位。所以对于字体的设置,仍旧使用px作为单位,并配合用data-dpr属性来区分不同dpr下的的大小。

例如:

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;
}

手动配置dpr

引入执行js之前,可以通过输出meta标签方式来手动设置dpr。语法如下:

<meta name="flexible" content="initial-dpr=2,maximum-dpr=3" />

其中initial-dpr会把dpr强制设置为给定的值,maximum-dpr会比较系统的dpr和给定的dpr,取最小值。注意:这两个参数只能选其一。

手动设置rem基准值的方法

输出如下css样式即可:

html {font-size: 60px!important;}

一些常用APIs

[Number] lib.flexible.dpr

当前页面的dpr值

[Number] lib.flexible.rem

当前页面的rem基准值

[Number|String] lib.flexible.rem2px([Number|String digital])

把rem转换为px

[Number|String] lib.flexible.px2rem([Number|String digital])

把px转换为rem

lib.flexible.refreshRem()

刷新当前页面的rem基准值

栅格系统

需引入makegrid.js

<script src="http://g.tbcdn.cn/mtb/lib-flexible/{{version}}/makegrid.js"></script>

使用方法

lib.flexible.makeGrid(params)
  • [Object params]
    • designWidth - 设计稿宽度
    • designUnit - 设计稿最小单位a(以px为单位)
    • columnCount - 栅格列数
    • columnXUnit - 栅格列宽(以a为单位)
    • gutterXUnit - 栅格间距(以a为单位)
    • edgeXUnit - 页面左右边距(以a为单位)
    • className - 栅格样式的名称(可省略,默认为grid)

通过传入视觉的栅格规范定义,可以输出对应的css样式。

lib.flexible.makeGridMode(modeName)
  • [String modeName]

方案还预置了几个默认的栅格规范,分别是750-12750-6640-12640-6

利用meta输出栅格样式

<meta content="designWidth=750, desginUnit=6, columnCount=12, columnXUnit=7, gutterXUnit=3, edgeXUnit=4" name="grid" />

<meta content="modeName=750-12" name="grid" />

栅格代码举例

<div class="grid">
    <div class="col-4"></div>
    <div class="col-4"></div>
    <div class="col-4"></div>
</div>

<div class="grid">
    <div class="col-6"></div>
    <div class="col-6"></div>
</div>

<div class="grid">
    <div class="col-3"></div>
    <div class="col-4"></div>
    <div class="col-5"></div>
</div>

四类栅格在不同手机上的表现

栅格;