计算当前轮播可设置个数和宽度

计算当前轮播可设置个数和宽度.js

function getUsefulWidthCount({
        containerWidth,
        cardWidth=356, 
        borderWidth=10,
      }={}) {
      if(!containerWidth || containerWidth<=0) return [0, 0]
      let maxCountPer = 0, resultWith = 0

      const addNewCardWidth = () => (maxCountPer + 1) * (cardWidth + borderWidth) - borderWidth
      while(cardWidth>0 && containerWidth>0 && addNewCardWidth() <= containerWidth) {
        resultWith = addNewCardWidth() // 减去最后一个
        maxCountPer++
      }
      const count = Math.max(0, maxCountPer)
      return [count, resultWith]
    }