vue 将字节转为需要的格式，如KB MB GB

使用组件

<nFormatter :num="scope.row.fileSize"></nFormatter>

转换组件

/**
* @Author: 858834013@qq.com
* @Name: nFormatter
* @Date: 2022-01-16
* @Desc: 字节格式化
*/
<template>
  <div>
    {{ value }}
  </div>
</template>

<script>
export default {
  name: 'DateFormat',
  components: {},
  props: {
    num: {
      type: Number,
      default() {
        return 0
      }
    }
  },
  computed: {
    value: function() {
      return this.nFormatter2(this.num, 3)
    }
  },
  methods: {
    nFormatter(num, digits) {
      const si = [
        { value: 1, symbol: '' },
        { value: 1E3, symbol: 'K' },
        { value: 1E6, symbol: 'M' },
        { value: 1E9, symbol: 'G' },
        { value: 1E12, symbol: 'T' },
        { value: 1E15, symbol: 'P' },
        { value: 1E18, symbol: 'E' }
      ]
      const rx = /\.0+$|(\.[0-9]*[1-9])0+$/
      let i
      for (i = si.length - 1; i > 0; i--) {
        if (num >= si[i].value) {
          break
        }
      }
      return (num / si[i].value).toFixed(digits).replace(rx, '$1') + si[i].symbol
    },
    nFormatter2(num, digits) {
      const rx = /\.0+$|(\.[0-9]*[1-9])0+$/
      return (num / 1E6).toFixed(digits).replace(rx, '$1') + 'M'
    }
  }
}
</script>

<style lang="scss" scoped>

</style>