code: function insert(wxss, id) {
    if (!Array.isArray(wxss)) {
      wxss = [wxss]
    }
  
    // 删除已插入的
    document.querySelectorAll(`style#${id}`).forEach(style => {
      style.parentNode.removeChild(style)
    })
  
    const style = document.createElement('style')
    style.type = 'text/css'
    style.id = id
    style.innerHTML = _.transformRpx(wxss.join(''))
  
    document.getElementsByTagName('head').item(0).appendChild(style)
  }
docs: 插入 wxss