vue 导出功能

 _createElement (entries)  {
        let { tag, attr } = entries
        let node = document.createElement(tag)
        for (let key in attr) {
          node.setAttribute(key, attr[key])
        }
        return node
        // fn && fn(node)
        // // 返回值只为了做测试用例
        // return node ? true : false
      },
      openForm (url, params, method)  {
        console.log(url, params, method)
        const form = this._createElement(({
          tag: 'form',
          attr: {
            id: 'newsForm',
            name: 'newsForm',
            target: '_blank',
            method: method,
            action: url
          }
        }))
        Object.keys(params).forEach(item=>{
          let input = document.createElement('input')
          input.type = 'text'
          input.name = item
          input.value = params[item]
          form.appendChild(input)
        })
        console.log(form)
        document.body.appendChild(form)
        form.submit()
        document.body.removeChild(form)
      },
      // 导出
      exportData () {
        const url = `${globalDefine.POST_URL}/manage/data/statistics/follow/export/${this.type}`
        this.openForm(url, this.params, "POST")
      },