手机适配（依附于Sass或less）

下面的代码是拷贝自淘宝的手机app，当然，有的变量还原了，有的注释了。直接引用这个js，不需要设计viewport标签

!function(e){function t(){var t=o.getBoundingClientRect().width;t/i>540&&(t=540*i),e.rem=t/16,o.style.fontSize=e.rem+"px"}var i,a,n,r=e.document,o=r.documentElement,l=r.querySelector('meta[name="viewport"]'),m=r.querySelector('meta[name="flexible"]');if(l){(s=l.getAttribute("content").match(/initial\-scale=(["']?)([\d\.]+)\1?/))&&(a=parseFloat(s[2]),i=parseInt(1/a))}else if(m){var s=m.getAttribute("content").match(/initial\-dpr=(["']?)([\d\.]+)\1?/);s&&(i=parseFloat(s[2]),a=parseFloat((1/i).toFixed(2)))}if(!i&&!a){var d=(e.navigator.appVersion.match(/android/gi),e.navigator.appVersion.match(/iphone/gi));i=e.devicePixelRatio,a=1/(i=d?i>=3?3:i>=2?2:1:1)}if(o.setAttribute("data-dpr",i),!l)if((l=r.createElement("meta")).setAttribute("name","viewport"),l.setAttribute("content","initial-scale="+a+", maximum-scale="+a+", minimum-scale="+a+", user-scalable=no"),o.firstElementChild)o.firstElementChild.appendChild(l);else{var c=r.createElement("div");c.appendChild(l),r.write(c.innerHTML)}e.dpr=i,e.addEventListener("resize",function(){clearTimeout(n),n=setTimeout(t,300)},!1),e.addEventListener("pageshow",function(e){e.persisted&&(clearTimeout(n),n=setTimeout(t,300))},!1),t()}(window);

Sass相对变量

/*手机端尺寸自适应尺寸文件，以640宽度，40px作为最小大小,1px=1/40rem*/
$_1:.025rem;
$_2:.05rem;
$_3:.075rem;
$_4:.1rem;
$_5:.125rem;
$_6:.15rem;
$_7:.175rem;
$_8:.2rem;
$_9:.225rem;
$_10:.25rem;
$_11:.275rem;
$_12:.3rem;
$_13:.325rem;
$_14:.35rem;
$_15:.375rem;
$_16:.4rem;
$_17:.425rem;
$_18:.45rem;
$_19:.475rem;
$_20:.5rem;
$_21:.525rem;
$_22:.55rem;
$_23:.575rem;
$_24:.6rem;
$_25:.625rem;
$_26:.65rem;
$_27:.675rem;
$_28:.7rem;
$_29:.725rem;
$_30:.75rem;
$_31:.775rem;
$_32:.8rem;
$_33:.825rem;
$_34:.85rem;
$_35:.875rem;
$_36:.9rem;
$_37:.925rem;
$_38:.95rem;
$_39:.975rem;
$_40:1rem;
$_41:1.025rem;
$_42:1.05rem;
$_43:1.075rem;
$_44:1.1rem;
$_45:1.125rem;
$_46:1.15rem;
$_47:1.175rem;
$_48:1.2rem;
$_49:1.225rem;
$_50:1.25rem;
$_51:1.275rem;
$_52:1.3rem;
$_53:1.325rem;
$_54:1.35rem;
$_55:1.375rem;
$_56:1.4rem;
$_57:1.425rem;
$_58:1.45rem;
$_59:1.475rem;
$_60:1.5rem;
$_61:1.525rem;
$_62:1.55rem;
$_63:1.575rem;
$_64:1.6rem;
$_65:1.625rem;
$_66:1.65rem;
$_67:1.675rem;
$_68:1.7rem;
$_69:1.725rem;
$_70:1.75rem;
$_71:1.775rem;
$_72:1.8rem;
$_73:1.825rem;
$_74:1.85rem;
$_75:1.875rem;
$_76:1.9rem;
$_77:1.925rem;
$_78:1.95rem;
$_79:1.975rem;
$_80:2rem;
$_81:2.025rem;
$_82:2.05rem;
$_83:2.075rem;
$_84:2.1rem;
$_85:2.125rem;
$_86:2.15rem;
$_87:2.175rem;
$_88:2.2rem;
$_89:2.225rem;
$_90:2.25rem;
$_91:2.275rem;
$_92:2.3rem;
$_93:2.325rem;
$_94:2.35rem;
$_95:2.375rem;
$_96:2.4rem;
$_97:2.425rem;
$_98:2.45rem;
$_99:2.475rem;
$_100:2.5rem;
$_101:2.525rem;
$_102:2.55rem;
$_103:2.575rem;
$_104:2.6rem;
$_105:2.625rem;
$_106:2.65rem;
$_107:2.675rem;
$_108:2.7rem;
$_109:2.725rem;
$_110:2.75rem;
$_111:2.775rem;
$_112:2.8rem;
$_113:2.825rem;
$_114:2.85rem;
$_115:2.875rem;
$_116:2.9rem;
$_117:2.925rem;
$_118:2.95rem;
$_119:2.975rem;
$_120:3rem;
$_121:3.025rem;
$_122:3.05rem;
$_123:3.075rem;
$_124:3.1rem;
$_125:3.125rem;
$_126:3.15rem;
$_127:3.175rem;
$_128:3.2rem;
$_129:3.225rem;
$_130:3.25rem;
$_131:3.275rem;
$_132:3.3rem;
$_133:3.325rem;
$_134:3.35rem;
$_135:3.375rem;
$_136:3.4rem;
$_137:3.425rem;
$_138:3.45rem;
$_139:3.475rem;
$_140:3.5rem;
$_141:3.525rem;
$_142:3.55rem;
$_143:3.575rem;
$_144:3.6rem;
$_145:3.625rem;
$_146:3.65rem;
$_147:3.675rem;
$_148:3.7rem;
$_149:3.725rem;
$_150:3.75rem;
$_151:3.775rem;
$_152:3.8rem;
$_153:3.825rem;
$_154:3.85rem;
$_155:3.875rem;
$_156:3.9rem;
$_157:3.925rem;
$_158:3.95rem;
$_159:3.975rem;
$_160:4rem;
$_161:4.025rem;
$_162:4.05rem;
$_163:4.075rem;
$_164:4.1rem;
$_165:4.125rem;
$_166:4.15rem;
$_167:4.175rem;
$_168:4.2rem;
$_169:4.225rem;
$_170:4.25rem;
$_171:4.275rem;
$_172:4.3rem;
$_173:4.325rem;
$_174:4.35rem;
$_175:4.375rem;
$_176:4.4rem;
$_177:4.425rem;
$_178:4.45rem;
$_179:4.475rem;
$_180:4.5rem;
$_181:4.525rem;
$_182:4.55rem;
$_183:4.575rem;
$_184:4.6rem;
$_185:4.625rem;
$_186:4.65rem;
$_187:4.675rem;
$_188:4.7rem;
$_189:4.725rem;
$_190:4.75rem;
$_191:4.775rem;
$_192:4.8rem;
$_193:4.825rem;
$_194:4.85rem;
$_195:4.875rem;
$_196:4.9rem;
$_197:4.925rem;
$_198:4.95rem;
$_199:4.975rem;
$_200:5rem;
$_201:5.025rem;
$_202:5.05rem;
$_203:5.075rem;
$_204:5.1rem;
$_205:5.125rem;
$_206:5.15rem;
$_207:5.175rem;
$_208:5.2rem;
$_209:5.225rem;
$_210:5.25rem;
$_211:5.275rem;
$_212:5.3rem;
$_213:5.325rem;
$_214:5.35rem;
$_215:5.375rem;
$_216:5.4rem;
$_217:5.425rem;
$_218:5.45rem;
$_219:5.475rem;
$_220:5.5rem;
$_221:5.525rem;
$_222:5.55rem;
$_223:5.575rem;
$_224:5.6rem;
$_225:5.625rem;
$_226:5.65rem;
$_227:5.675rem;
$_228:5.7rem;
$_229:5.725rem;
$_230:5.75rem;
$_231:5.775rem;
$_232:5.8rem;
$_233:5.825rem;
$_234:5.85rem;
$_235:5.875rem;
$_236:5.9rem;
$_237:5.925rem;
$_238:5.95rem;
$_239:5.975rem;
$_240:6rem;
$_241:6.025rem;
$_242:6.05rem;
$_243:6.075rem;
$_244:6.1rem;
$_245:6.125rem;
$_246:6.15rem;
$_247:6.175rem;
$_248:6.2rem;
$_249:6.225rem;
$_250:6.25rem;
$_251:6.275rem;
$_252:6.3rem;
$_253:6.325rem;
$_254:6.35rem;
$_255:6.375rem;
$_256:6.4rem;
$_257:6.425rem;
$_258:6.45rem;
$_259:6.475rem;
$_260:6.5rem;
$_261:6.525rem;
$_262:6.55rem;
$_263:6.575rem;
$_264:6.6rem;
$_265:6.625rem;
$_266:6.65rem;
$_267:6.675rem;
$_268:6.7rem;
$_269:6.725rem;
$_270:6.75rem;
$_271:6.775rem;
$_272:6.8rem;
$_273:6.825rem;
$_274:6.85rem;
$_275:6.875rem;
$_276:6.9rem;
$_277:6.925rem;
$_278:6.95rem;
$_279:6.975rem;
$_280:7rem;
$_281:7.025rem;
$_282:7.05rem;
$_283:7.075rem;
$_284:7.1rem;
$_285:7.125rem;
$_286:7.15rem;
$_287:7.175rem;
$_288:7.2rem;
$_289:7.225rem;
$_290:7.25rem;
$_291:7.275rem;
$_292:7.3rem;
$_293:7.325rem;
$_294:7.35rem;
$_295:7.375rem;
$_296:7.4rem;
$_297:7.425rem;
$_298:7.45rem;
$_299:7.475rem;
$_300:7.5rem;
$_301:7.525rem;
$_302:7.55rem;
$_303:7.575rem;
$_304:7.6rem;
$_305:7.625rem;
$_306:7.65rem;
$_307:7.675rem;
$_308:7.7rem;
$_309:7.725rem;
$_310:7.75rem;
$_311:7.775rem;
$_312:7.8rem;
$_313:7.825rem;
$_314:7.85rem;
$_315:7.875rem;
$_316:7.9rem;
$_317:7.925rem;
$_318:7.95rem;
$_319:7.975rem;
$_320:8rem;
$_321:8.025rem;
$_322:8.05rem;
$_323:8.075rem;
$_324:8.1rem;
$_325:8.125rem;
$_326:8.15rem;
$_327:8.175rem;
$_328:8.2rem;
$_329:8.225rem;
$_330:8.25rem;
$_331:8.275rem;
$_332:8.3rem;
$_333:8.325rem;
$_334:8.35rem;
$_335:8.375rem;
$_336:8.4rem;
$_337:8.425rem;
$_338:8.45rem;
$_339:8.475rem;
$_340:8.5rem;
$_341:8.525rem;
$_342:8.55rem;
$_343:8.575rem;
$_344:8.6rem;
$_345:8.625rem;
$_346:8.65rem;
$_347:8.675rem;
$_348:8.7rem;
$_349:8.725rem;
$_350:8.75rem;
$_351:8.775rem;
$_352:8.8rem;
$_353:8.825rem;
$_354:8.85rem;
$_355:8.875rem;
$_356:8.9rem;
$_357:8.925rem;
$_358:8.95rem;
$_359:8.975rem;
$_360:9rem;
$_361:9.025rem;
$_362:9.05rem;
$_363:9.075rem;
$_364:9.1rem;
$_365:9.125rem;
$_366:9.15rem;
$_367:9.175rem;
$_368:9.2rem;
$_369:9.225rem;
$_370:9.25rem;
$_371:9.275rem;
$_372:9.3rem;
$_373:9.325rem;
$_374:9.35rem;
$_375:9.375rem;
$_376:9.4rem;
$_377:9.425rem;
$_378:9.45rem;
$_379:9.475rem;
$_380:9.5rem;
$_381:9.525rem;
$_382:9.55rem;
$_383:9.575rem;
$_384:9.6rem;
$_385:9.625rem;
$_386:9.65rem;
$_387:9.675rem;
$_388:9.7rem;
$_389:9.725rem;
$_390:9.75rem;
$_391:9.775rem;
$_392:9.8rem;
$_393:9.825rem;
$_394:9.85rem;
$_395:9.875rem;
$_396:9.9rem;
$_397:9.925rem;
$_398:9.95rem;
$_399:9.975rem;
$_400:10rem;

Less相对变量

/*手机端尺寸自适应尺寸文件，以640宽度，40px作为最小大小,1px=1/40rem*/
@_1:.025rem;
@_2:.05rem;
@_3:.075rem;
@_4:.1rem;
@_5:.125rem;
@_6:.15rem;
@_7:.175rem;
@_8:.2rem;
@_9:.225rem;
@_10:.25rem;
@_11:.275rem;
@_12:.3rem;
@_13:.325rem;
@_14:.35rem;
@_15:.375rem;
@_16:.4rem;
@_17:.425rem;
@_18:.45rem;
@_19:.475rem;
@_20:.5rem;
@_21:.525rem;
@_22:.55rem;
@_23:.575rem;
@_24:.6rem;
@_25:.625rem;
@_26:.65rem;
@_27:.675rem;
@_28:.7rem;
@_29:.725rem;
@_30:.75rem;
@_31:.775rem;
@_32:.8rem;
@_33:.825rem;
@_34:.85rem;
@_35:.875rem;
@_36:.9rem;
@_37:.925rem;
@_38:.95rem;
@_39:.975rem;
@_40:1rem;
@_41:1.025rem;
@_42:1.05rem;
@_43:1.075rem;
@_44:1.1rem;
@_45:1.125rem;
@_46:1.15rem;
@_47:1.175rem;
@_48:1.2rem;
@_49:1.225rem;
@_50:1.25rem;
@_51:1.275rem;
@_52:1.3rem;
@_53:1.325rem;
@_54:1.35rem;
@_55:1.375rem;
@_56:1.4rem;
@_57:1.425rem;
@_58:1.45rem;
@_59:1.475rem;
@_60:1.5rem;
@_61:1.525rem;
@_62:1.55rem;
@_63:1.575rem;
@_64:1.6rem;
@_65:1.625rem;
@_66:1.65rem;
@_67:1.675rem;
@_68:1.7rem;
@_69:1.725rem;
@_70:1.75rem;
@_71:1.775rem;
@_72:1.8rem;
@_73:1.825rem;
@_74:1.85rem;
@_75:1.875rem;
@_76:1.9rem;
@_77:1.925rem;
@_78:1.95rem;
@_79:1.975rem;
@_80:2rem;
@_81:2.025rem;
@_82:2.05rem;
@_83:2.075rem;
@_84:2.1rem;
@_85:2.125rem;
@_86:2.15rem;
@_87:2.175rem;
@_88:2.2rem;
@_89:2.225rem;
@_90:2.25rem;
@_91:2.275rem;
@_92:2.3rem;
@_93:2.325rem;
@_94:2.35rem;
@_95:2.375rem;
@_96:2.4rem;
@_97:2.425rem;
@_98:2.45rem;
@_99:2.475rem;
@_100:2.5rem;
@_101:2.525rem;
@_102:2.55rem;
@_103:2.575rem;
@_104:2.6rem;
@_105:2.625rem;
@_106:2.65rem;
@_107:2.675rem;
@_108:2.7rem;
@_109:2.725rem;
@_110:2.75rem;
@_111:2.775rem;
@_112:2.8rem;
@_113:2.825rem;
@_114:2.85rem;
@_115:2.875rem;
@_116:2.9rem;
@_117:2.925rem;
@_118:2.95rem;
@_119:2.975rem;
@_120:3rem;
@_121:3.025rem;
@_122:3.05rem;
@_123:3.075rem;
@_124:3.1rem;
@_125:3.125rem;
@_126:3.15rem;
@_127:3.175rem;
@_128:3.2rem;
@_129:3.225rem;
@_130:3.25rem;
@_131:3.275rem;
@_132:3.3rem;
@_133:3.325rem;
@_134:3.35rem;
@_135:3.375rem;
@_136:3.4rem;
@_137:3.425rem;
@_138:3.45rem;
@_139:3.475rem;
@_140:3.5rem;
@_141:3.525rem;
@_142:3.55rem;
@_143:3.575rem;
@_144:3.6rem;
@_145:3.625rem;
@_146:3.65rem;
@_147:3.675rem;
@_148:3.7rem;
@_149:3.725rem;
@_150:3.75rem;
@_151:3.775rem;
@_152:3.8rem;
@_153:3.825rem;
@_154:3.85rem;
@_155:3.875rem;
@_156:3.9rem;
@_157:3.925rem;
@_158:3.95rem;
@_159:3.975rem;
@_160:4rem;
@_161:4.025rem;
@_162:4.05rem;
@_163:4.075rem;
@_164:4.1rem;
@_165:4.125rem;
@_166:4.15rem;
@_167:4.175rem;
@_168:4.2rem;
@_169:4.225rem;
@_170:4.25rem;
@_171:4.275rem;
@_172:4.3rem;
@_173:4.325rem;
@_174:4.35rem;
@_175:4.375rem;
@_176:4.4rem;
@_177:4.425rem;
@_178:4.45rem;
@_179:4.475rem;
@_180:4.5rem;
@_181:4.525rem;
@_182:4.55rem;
@_183:4.575rem;
@_184:4.6rem;
@_185:4.625rem;
@_186:4.65rem;
@_187:4.675rem;
@_188:4.7rem;
@_189:4.725rem;
@_190:4.75rem;
@_191:4.775rem;
@_192:4.8rem;
@_193:4.825rem;
@_194:4.85rem;
@_195:4.875rem;
@_196:4.9rem;
@_197:4.925rem;
@_198:4.95rem;
@_199:4.975rem;
@_200:5rem;
@_201:5.025rem;
@_202:5.05rem;
@_203:5.075rem;
@_204:5.1rem;
@_205:5.125rem;
@_206:5.15rem;
@_207:5.175rem;
@_208:5.2rem;
@_209:5.225rem;
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@_211:5.275rem;
@_212:5.3rem;
@_213:5.325rem;
@_214:5.35rem;
@_215:5.375rem;
@_216:5.4rem;
@_217:5.425rem;
@_218:5.45rem;
@_219:5.475rem;
@_220:5.5rem;
@_221:5.525rem;
@_222:5.55rem;
@_223:5.575rem;
@_224:5.6rem;
@_225:5.625rem;
@_226:5.65rem;
@_227:5.675rem;
@_228:5.7rem;
@_229:5.725rem;
@_230:5.75rem;
@_231:5.775rem;
@_232:5.8rem;
@_233:5.825rem;
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@_235:5.875rem;
@_236:5.9rem;
@_237:5.925rem;
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@_240:6rem;
@_241:6.025rem;
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@_243:6.075rem;
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@_246:6.15rem;
@_247:6.175rem;
@_248:6.2rem;
@_249:6.225rem;
@_250:6.25rem;
@_251:6.275rem;
@_252:6.3rem;
@_253:6.325rem;
@_254:6.35rem;
@_255:6.375rem;
@_256:6.4rem;
@_257:6.425rem;
@_258:6.45rem;
@_259:6.475rem;
@_260:6.5rem;
@_261:6.525rem;
@_262:6.55rem;
@_263:6.575rem;
@_264:6.6rem;
@_265:6.625rem;
@_266:6.65rem;
@_267:6.675rem;
@_268:6.7rem;
@_269:6.725rem;
@_270:6.75rem;
@_271:6.775rem;
@_272:6.8rem;
@_273:6.825rem;
@_274:6.85rem;
@_275:6.875rem;
@_276:6.9rem;
@_277:6.925rem;
@_278:6.95rem;
@_279:6.975rem;
@_280:7rem;
@_281:7.025rem;
@_282:7.05rem;
@_283:7.075rem;
@_284:7.1rem;
@_285:7.125rem;
@_286:7.15rem;
@_287:7.175rem;
@_288:7.2rem;
@_289:7.225rem;
@_290:7.25rem;
@_291:7.275rem;
@_292:7.3rem;
@_293:7.325rem;
@_294:7.35rem;
@_295:7.375rem;
@_296:7.4rem;
@_297:7.425rem;
@_298:7.45rem;
@_299:7.475rem;
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@_301:7.525rem;
@_302:7.55rem;
@_303:7.575rem;
@_304:7.6rem;
@_305:7.625rem;
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@_307:7.675rem;
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@_309:7.725rem;
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@_311:7.775rem;
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@_317:7.925rem;
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@_319:7.975rem;
@_320:8rem;
@_321:8.025rem;
@_322:8.05rem;
@_323:8.075rem;
@_324:8.1rem;
@_325:8.125rem;
@_326:8.15rem;
@_327:8.175rem;
@_328:8.2rem;
@_329:8.225rem;
@_330:8.25rem;
@_331:8.275rem;
@_332:8.3rem;
@_333:8.325rem;
@_334:8.35rem;
@_335:8.375rem;
@_336:8.4rem;
@_337:8.425rem;
@_338:8.45rem;
@_339:8.475rem;
@_340:8.5rem;
@_341:8.525rem;
@_342:8.55rem;
@_343:8.575rem;
@_344:8.6rem;
@_345:8.625rem;
@_346:8.65rem;
@_347:8.675rem;
@_348:8.7rem;
@_349:8.725rem;
@_350:8.75rem;
@_351:8.775rem;
@_352:8.8rem;
@_353:8.825rem;
@_354:8.85rem;
@_355:8.875rem;
@_356:8.9rem;
@_357:8.925rem;
@_358:8.95rem;
@_359:8.975rem;
@_360:9rem;
@_361:9.025rem;
@_362:9.05rem;
@_363:9.075rem;
@_364:9.1rem;
@_365:9.125rem;
@_366:9.15rem;
@_367:9.175rem;
@_368:9.2rem;
@_369:9.225rem;
@_370:9.25rem;
@_371:9.275rem;
@_372:9.3rem;
@_373:9.325rem;
@_374:9.35rem;
@_375:9.375rem;
@_376:9.4rem;
@_377:9.425rem;
@_378:9.45rem;
@_379:9.475rem;
@_380:9.5rem;
@_381:9.525rem;
@_382:9.55rem;
@_383:9.575rem;
@_384:9.6rem;
@_385:9.625rem;
@_386:9.65rem;
@_387:9.675rem;
@_388:9.7rem;
@_389:9.725rem;
@_390:9.75rem;
@_391:9.775rem;
@_392:9.8rem;
@_393:9.825rem;
@_394:9.85rem;
@_395:9.875rem;
@_396:9.9rem;
@_397:9.925rem;
@_398:9.95rem;
@_399:9.975rem;
@_400:10rem;

未压缩

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        if(domWidth / v > 540){
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        }
        win.rem = domWidth / 16;
        domEle.style.fontSize = win.rem + "px";
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        var o = viewport.getAttribute("content").match(/initial\-scale=(["']?)([\d\.]+)\1?/);
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        var o = flexible.getAttribute("content").match(/initial\-dpr=(["']?)([\d\.]+)\1?/);
        if (o) {
            v = parseFloat(o[2]);
            initial_scale = parseFloat((1 / v).toFixed(2))
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    if (!v && !initial_scale) {
        var n = (win.navigator.appVersion.match(/android/gi), win.navigator.appVersion.match(/iphone/gi));
        v = win.devicePixelRatio;
        v = n ? v >= 3 ? 3 : v >= 2 ? 2 : 1 : 1, initial_scale = 1 / v
    }
    //没有viewport标签的情况下
    if (domEle.setAttribute("data-dpr", v), !viewport) {
        if (viewport = dom.createElement("meta"), viewport.setAttribute("name", "viewport"), viewport.setAttribute("content", "initial-scale=" + initial_scale + ", maximum-scale=" + initial_scale + ", minimum-scale=" + initial_scale + ", user-scalable=no"), domEle.firstElementChild) {
            domEle.firstElementChild.appendChild(viewport)
        } else {
            var m = dom.createElement("div");
            m.appendChild(viewport), dom.write(m.innerHTML)
        }
    }
    win.dpr = v;
    win.addEventListener("resize", function() {
        clearTimeout(timeCode), timeCode = setTimeout(resize, 300)
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    win.addEventListener("pageshow", function(b) {
        b.persisted && (clearTimeout(timeCode), timeCode = setTimeout(resize, 300))
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