下载文件的三种方法

 // 方法一
    exportData(url){
        window.open(url)
    },

    // 方法二   
    download(filename, url) {
      var pom = document.createElement("a");
      pom.setAttribute("href",url);
      pom.setAttribute("download", filename);
      if (document.createEvent) {
        var event = document.createEvent("MouseEvents");
        event.initEvent("click", true, true);
        pom.dispatchEvent(event);
      } else {
        pom.click();
      }
    },
    
    // 方法三  
    downloadFile(url , name , headers = {} , param = {}){
        let paramAll = Object.assign({_cache:Date.now()} , param);
        axios.get(url , {
            headers,
            responseType:'blob', // important
            params:paramAll
        }).then((response)=>{
            const url = window.URL.createObjectURL(new Blob([response.data]));
            const link = document.createElement('a');
            link.href = url;
            link.setAttribute('download',name);
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        })
    },

⚠️前两种方法在下载txt文件的时候，是直接在浏览器中打开