text: export function Behavior (options) {
    return options
  }
  
  export function getPreload (current) {
    return function (key, val) {
      if (typeof key === 'object') {
        current.preloadData = key
      } else if (key !== undefined && val !== undefined) {
        current.preloadData = {
          [key]: val
        }
      }
    }
  }
  
  export function getInitPxTransform (taro) {
    return function (config) {
      const {
        designWidth = 750,
        deviceRatio = {
          640: 2.34 / 2,
          750: 1,
          828: 1.81 / 2
        }
      } = config
      taro.config = taro.config || {}
      taro.config.designWidth = designWidth
      taro.config.deviceRatio = deviceRatio
    }
  }
  
  export function getPxTransform (taro) {
    return function (size) {
      const {
        designWidth = 750,
        deviceRatio = {
          640: 2.34 / 2,
          750: 1,
          828: 1.81 / 2
        }
      } = taro.config || {}
      if (!(designWidth in deviceRatio)) {
        throw new Error(`deviceRatio 配置中不存在 ${designWidth} 的设置！`)
      }
      return (parseInt(size, 10) * deviceRatio[designWidth]) + 'rpx'
    }
  }
  