判断文件类型

<img class="cell-img" slot="icon" width="38" :src="item.fileName | judgeType">

  filters: {
    judgeType(value) {
      //判断文件类型
      var type = value.substr(value.lastIndexOf(".")).toLowerCase();
      const DOC_TYPE = [".doc", ".docx", ".wps", ".txt"];
      const IMG_TYPE = [".png",".jpg",".jpeg",".gif",".bmp",".psd",".tiff",".tga","eps"];
      const AUDIO_TYPE = [".mp3", ".wav", ".ape", ".wma", ".mid"];
      const VIDEO_TYPE = [".mp4", ".rmvb", ".avi", ".ts", ".rmvb"];
      const EXCEL_TYPE = [".xlsx", ".xls"];
      const PDF_TYPE = [".pdf"];
      
      if (DOC_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/doc.png");
      } else if (IMG_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/img.png");
      } else if (AUDIO_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/aud.png");
      } else if (VIDEO_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/video.png");
      } else if (EXCEL_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/5.png");
      } else if (PDF_TYPE.indexOf(type) != -1) {
        return require("@/assets/images/icon/6.png");
      }
    }
  }