nuxt 移动端适配

Posted 2021-09-04 SuperAnt_me

nuxt 移动端适配 （flexible + postcss-px2rem）

flexible.js 根据需求自定义内容

(function flexible (window, document) {
  let docEl = document.documentElement
  let dpr = window.devicePixelRatio || 1

  // adjust body font size
  function setBodyFontSize () {
    if (document.body)
      document.body.style.fontSize = (12 * dpr) + 'px'
    else
      document.addEventListener('DOMContentLoaded', setBodyFontSize)
  }
  setBodyFontSize()

  // set 1rem = viewWidth / 10
  function setRemUnit () {
    let rem = docEl.clientWidth / 10
    docEl.style.fontSize = rem + 'px'
  }

  setRemUnit()

  // reset rem unit on page resize
  window.addEventListener('resize', setRemUnit)
  window.addEventListener('pageshow', function (e) {
    if (e.persisted)
      setRemUnit()
  })

  // detect 0.5px supports
  if (dpr >= 2) {
    let fakeBody = document.createElement('body')
    let testElement = document.createElement('div')
    testElement.style.border = '.5px solid transparent'
    fakeBody.appendChild(testElement)
    docEl.appendChild(fakeBody)
    if (testElement.offsetHeight === 1)
      docEl.classList.add('hairlines')

    docEl.removeChild(fakeBody)
  }
}(window, document))

flexible.js 兼容文件

(function(win, lib) {
  var doc = win.document
  var docEl = doc.documentElement
  var metaEl = doc.querySelector('meta[name="viewport"]')
  var flexibleEl = doc.querySelector('meta[name="flexible"]')
  var dpr = 0
  var scale = 0
  var tid
  var flexible = lib.flexible || (lib.flexible = {})
 
  if (metaEl) {
    console.warn('将根据已有的meta标签来设置缩放比例')
    var match = metaEl.getAttribute('content').match(/initial\\-scale=([\\d\\.]+)/)
    if (match) {
      scale = parseFloat(match[1])
      dpr = parseInt(1 / scale)
    }
  } else if (flexibleEl) {
    var content = flexibleEl.getAttribute('content')
    if (content) {
      var initialDpr = content.match(/initial\\-dpr=([\\d\\.]+)/)
      var maximumDpr = content.match(/maximum\\-dpr=([\\d\\.]+)/)
      if (initialDpr) {
        dpr = parseFloat(initialDpr[1])
        scale = parseFloat((1 / dpr).toFixed(2))
      }
      if (maximumDpr) {
        dpr = parseFloat(maximumDpr[1])
        scale = parseFloat((1 / dpr).toFixed(2))
      }
    }
  }
 
  if (!dpr && !scale) {
    var isandroid = win.navigator.appVersion.match(/android/gi)
    var isIPhone = win.navigator.appVersion.match(/iphone/gi)
    var devicePixelRatio = win.devicePixelRatio
    if (isIPhone) {
      // ios下，对于2和3的屏，用2倍的方案，其余的用1倍方案
      if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {
        dpr = 3
      } else if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)) {
        dpr = 2
      } else {
        dpr = 1
      }
    } else {
      // 其他设备下，仍旧使用1倍的方案
      dpr = 1
    }
    scale = 1 / dpr
  }
 
  docEl.setAttribute('data-dpr', dpr)
  if (!metaEl) {
    metaEl = doc.createElement('meta')
    metaEl.setAttribute('name', 'viewport')
    metaEl.setAttribute(
      'content',
      'initial-scale=' +
        scale +
        ', maximum-scale=' +
        scale +
        ', minimum-scale=' +
        scale +
        ', user-scalable=no'
    )
    if (docEl.firstElementChild) {
      docEl.firstElementChild.appendChild(metaEl)
    } else {
      var wrap = doc.createElement('div')
      wrap.appendChild(metaEl)
      doc.write(wrap.innerhtml)
    }
  }
 
  function refreshRem() {
    var width = docEl.getBoundingClientRect().width
    if (width / dpr > 540) {
      width = 540 * dpr
    }
    var rem = width / 10
    docEl.style.fontSize = rem + 'px'
    flexible.rem = win.rem = rem
  }
 
  win.addEventListener(
    'resize',
    function() {
      clearTimeout(tid)
      tid = setTimeout(refreshRem, 300)
    },
    false
  )
  win.addEventListener(
    'pageshow',
    function(e) {
      if (e.persisted) {
        clearTimeout(tid)
        tid = setTimeout(refreshRem, 300)
      }
    },
    false
  )
 
  if (doc.readyState === 'complete') {
    doc.body.style.fontSize = 12 * dpr + 'px'
  } else {
    doc.addEventListener(
      'DOMContentLoaded',
      function(e) {
        doc.body.style.fontSize = 12 * dpr + 'px'
      },
      false
    )
  }
 
  refreshRem()
 
  flexible.dpr = win.dpr = dpr
  flexible.refreshRem = refreshRem
  flexible.rem2px = function(d) {
    var val = parseFloat(d) * this.rem
    if (typeof d === 'string' && d.match(/rem$/)) {
      val += 'px'
    }
    return val
  }
  flexible.px2rem = function(d) {
    var val = parseFloat(d) / this.rem
    if (typeof d === 'string' && d.match(/px$/)) {
      val += 'rem'
    }
    return val
  }
})(window, window['lib'] || (window['lib'] = {}))

flexible 文件引用

• 全局
  • 在nuxt.config.js文件中配置head

  head:{
  	script:[
  		src:"/js/flexible.js", type: 'text/javascript', charset: 'utf-8'//移动端适配
  	]
  

• 单文件
  • 在需要自适应文件中设置head

  head:{
  	script:[
  		src:"/js/flexible.js", type: 'text/javascript', charset: 'utf-8'//移动端适配
  	]
  

  px2rem 插件配置

  //在build中配置
  build:{
  	postcss:[
  		require("postcss-px2rem")({
  			remUnit:75,//设计稿宽度：750px
  			remPrecision:2,//rem 取小数点后两位
  			}),
  		]
  	}	
  

  无需全局适配可使用 postcss-px2rem-include 或postcss-px2rem-exclude

  postcss-px2rem-include 配置

  build:{
  	postcss:{
  		plugins:{
  			'postcss-px2rem-include':{
  				remUnit:75,//设计稿宽度：750px
  				remPrecision:2,//rem 取小数点后两位
  				include:/pages.?xxx/ //只适配选中文件（正则匹配）
  				}
  			}
  		}
  	}
  

  postcss-px2rem-exclude 配置

  build:{
  	postcss:{
  		plugins:{
  			'postcss-px2rem-exclude':{
  				remUnit:75,//设计稿宽度：750px
  				remPrecision:2,//rem 取小数点后两位
  				exclude:/pages.?xxx/ //只适配非选中文件（正则匹配 排除文件）
  				}
  			}
  		}
  	}