前端实现文件在线预览txt，pdf，doc，xls，ppt几种格式

<iframe class="filename" :src="文件的地址" width='100%' height='600' frameborder='1' ></iframe>

<iframe class="filename"  :src="https://view.officeapps.live.com/op/view.aspx?src=后面是文件的地址" width='100%' height='600' frameborder='1' ></iframe>

for (let i=0;i<this.data.quoteinfo.goodslist.length;i++) {
    for(let j=0;j<this.data.quoteinfo.goodslist[i].goodsattachments.fileattachmentlist.length;j++){
      let value = this.data.quoteinfo.goodslist[i].goodsattachments.fileattachmentlist[j]
      let valueformat = value.name.substring(value.name.lastindexof('.') + 1)//前面逻辑不用看，至此拿到文件后缀
      if(valueformat=='doc'|| valueformat=='docx'|| valueformat=='xls' || valueformat=='xlsx') {//根据后缀判断如果是office格式的，做路径的拼接，拼接微软在线预览地址即可
      要预览的文件地址='https://view.officeapps.live.com/op/view.aspx?src='+要预览的文件地址
    }
  }
}