<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>利用Blob对象创建文件</title>
</head>
<body>
<textarea name="" id="downloadFileTextarea" cols="30" rows="10"></textarea>
<br>
<button id="downloadFileButton">downloadFileButton</button>
<script>
function downloadFile(fileName, content, blobOptions) {
// blobOptions = {
// type: 'text/csv',
// endings: 'native' // or transparent
// };
blobOptions = blobOptions || {};
var blob = new Blob([content], blobOptions);
var a = document.createElement('a');
a.innerHTML = fileName;
// 指定生成的文件名
a.download = fileName;
a.href = URL.createObjectURL(blob);
document.body.appendChild(a);
var evt = document.createEvent("MouseEvents");
evt.initEvent("click", false, false);
a.dispatchEvent(evt);
document.body.removeChild(a);
}
downloadFileButton.onclick = function() {
downloadFile('downloadFile.txt', downloadFileTextarea.value);
};
</script>
</body>
</html>
来源：https://blog.csdn.net/butterfly5211314/java/article/details/60757013
