移动端rem切图

1.为什么用rem

根据屏幕大小，自动调整大小

2.如何使用rem

分以下几步

a.用ps把设置稿弄成640px或者750px的（记得等比例缩放）

b.调试时记得把浏览器默认最小字体设置为最小。手机端是支持12px以下的字体的

c.引入meta头

    <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no,minimal-ui">

d.引入reset文件

?

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html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, button,article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; vertical-align: baseline; background: transparent; outline: none; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } ol, ul { list-style: none; } button{background: transparent;} blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; } strong { font-weight: bold; } table { border-collapse: collapse; border-spacing: 0; } img { border: 0; max-width: 100%; } html{ line-height: initial; } body{ font-size: 0.32rem; }

　　

e.引入js媒体查询文件

?

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(function(doc, win) { var docEl = doc.documentElement, resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize', recalc = function() { var clientWidth = docEl.clientWidth; if (!clientWidth) return; if (clientWidth >= 750) { docEl.style.fontSize = '100px'; } else { docEl.style.fontSize = 100 * (clientWidth / 750) + 'px'; } }; if (!doc.addEventListener) return; win.addEventListener(resizeEvt, recalc, false); doc.addEventListener('DOMContentLoaded', recalc, false); })(document, window);

　　

f.直接在750px或640px的情况下切图，单位也直接用px

g.到http://www.520ued.com/把px转为rem,html的字体大小填100px。

H.收工！！

参考资料:

http://www.520ued.com/

http://bbs.it-home.org/thread-64920-1-1.html