exportI:function(but){
    var v=this;
    resulta=document.getElementById('resulta');
    v.funDownload(resulta.value, 'test.js');//指定导出内容和文件名
},
// 下载文件方法
funDownload:function (content, filename) {
    console.log('funDownload');
    var eleLink = document.createElement('a');
    eleLink.download = filename;
    eleLink.style.display = 'none';
    // 字符内容转变成blob地址
    var blob = new Blob([content]);
     eleLink.href = URL.createObjectURL(blob);
     // 触发点击
    document.body.appendChild(eleLink);
     eleLink.click();
     // 然后移除
     document.body.removeChild(eleLink);
}

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