常用JS工具类 .....持续更新中 ...CV大法好

前端导出表格(兼容ie)
 if (res.status == "200") {
          const filename = res.headers["content-disposition"]
            .split(";")[1]
            .split("=")[1];
          const fileName = decodeURIComponent(filename);
          const blod = new Blob([res.data], {
            type: "application/x-xls;charset=utf-8",
          });
          if (!window.navigator.msSaveBlob) {
            const elink = document.createElement("a");
            elink.href = window.URL.createObjectURL(blod);
            elink.download = fileName;
            document.body.appendChild(elink);
            elink.click();
            window.URL.revokeObjectURL(elink.href);
            document.body.removeChild(elink);
          } else {
            // IE下载
            window.navigator.msSaveBlob(blod, fileName);
          }
        }

**
 * 格式化秒
 * @param int  value 总秒数
 * @return string result 格式化后的字符串
 */
function formatSeconds(value) { 
 var theTime = parseInt(value);// 需要转换的时间秒 
 var theTime1 = 0;// 分 
 var theTime2 = 0;// 小时 
 var theTime3 = 0;// 天
 if(theTime > 60) { 
  theTime1 = parseInt(theTime/60); 
  theTime = parseInt(theTime%60); 
  if(theTime1 > 60) { 
   theTime2 = parseInt(theTime1/60); 
   theTime1 = parseInt(theTime1%60); 
   if(theTime2 > 24){
    //大于24小时
    theTime3 = parseInt(theTime2/24);
    theTime2 = parseInt(theTime2%24);
   }
  } 
 } 
 var result = '';
 if(theTime > 0){
  result = ""+parseInt(theTime)+"秒";
 }
 if(theTime1 > 0) { 
  result = ""+parseInt(theTime1)+"分"+result; 
 } 
 if(theTime2 > 0) { 
  result = ""+parseInt(theTime2)+"小时"+result; 
 } 
 if(theTime3 > 0) { 
  result = ""+parseInt(theTime3)+"天"+result; 
 }
 return result; 
}

 //复制
  copy(id) {
    // 创建节点
    const range = document.createRange();
    // 选择节点
    range.selectNode(document.getElementById(id + ""));
    // 选择的文本范围
    const selection = window.getSelection();
    // （清除之前粘贴板内容，否则复制不上）
    if (selection.rangeCount > 0) {selection.removeAllRanges()};
    // 将一个Range对象添加到Selection对象中，该Range对象中所包含的内容将变为高亮 *选取* 状态。
    selection.addRange(range);
    // 调用复制功能
    document.execCommand("Copy");
    vueInstance.$message({
      message: '复制成功！',
      type: 'success',
      duration: 1000
    });
  },

  //转化日期格式  yyyy-MM-dd  hh:mm:ss
  formatDate() {
    Date.prototype.format = function (format) {
      if (!format) {
        format = "yyyy-MM-dd hh:mm:ss";
      }
      var o = {
        "M+": this.getMonth() + 1 /* month*/,
        "d+": this.getDate() /* day*/,
        "h+": this.getHours() /* hour*/,
        "m+": this.getMinutes() /* minute*/,
        "s+": this.getSeconds() /* second*/,
        "q+": Math.floor((this.getMonth() + 3) / 3) /* quarter*/,
        S: this.getMilliseconds()
      };
      if (/(y+)/.test(format)) {
        format = format.replace(
          RegExp.$1,
          (this.getFullYear() + "").substr(4 - RegExp.$1.length)
        );
      }
      for (var k in o) {
        if (new RegExp("(" + k + ")").test(format)) {
          format = format.replace(
            RegExp.$1,
            RegExp.$1.length == 1
              ? o[k]
              : ("00" + o[k]).substr(("" + o[k]).length)
          );
        }
      }
      return format;
    };
  }

 //设置cookie
  setCookie(c_name, value, expiredays) {
    var exdate = new Date();
    exdate.setFullYear(exdate.getFullYear() + expiredays);
    document.cookie =
      c_name +
      "=" +
      escape(value) +
      (expiredays == null ? "" : ";expires=" + exdate.toGMTString()) +
      ";path=/";
  },
  //获取cookie
  getCookie(c_name) {
    if (document.cookie.length > 0) {
      let c_start = document.cookie.indexOf(c_name + "=");
      if (c_start != -1) {
        c_start = c_start + c_name.length + 1;
        let c_end = document.cookie.indexOf(";", c_start);
        if (c_end == -1) c_end = document.cookie.length;
        return unescape(document.cookie.substring(c_start, c_end));
      }
    }
    return "";
  },