文件自动下载文件

let fileName = 'download.txt';
let fileContent = 'helloWorld';
let a = document.createElement('a');
a.download = fileName;
a.href = window.URL.createObjectURL(new Blob([fileContent]));
a.click();　

具体的总结下载可以看看这篇 很详细 https://segmentfault.com/a/1190000023731567?utm_source=sf-related

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