1、用到两个文件Blob.js和FileSaver.js
2、代码：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8"/>
<title>js导出excel-ComingX</title>
</head>
<body>
<h1> </h1>
<a>
<p><strong>数据内容:</strong></p>
<textarea rows="6" id="content">
姓名,学号,成绩
王三,103020120,98
张四,103020218,80
李石磊,20085802024,100
JohnsonLee,123654,523
</textarea>
<p>
<strong>文件名</strong>: <input type="text" name="filename" id="filename" value="hello.csv" /> (.csv后缀)
</p>
<p style="color: #3300ff;"">1. 使用FileSaver.js保存</p><button id="saveBtn">保存Excel文件</button>
</a>
<!--filesaver-->
<script async="" src="Blob.js"></script>
<script async="" src="FileSaver.js"></script>
<script>
(function () {
document.getElementById("saveBtn").onclick = function (event) {
event.preventDefault();
var BB = self.Blob;
var contentStr = document.getElementById("content").value; //内容
var fileNmae=document.getElementById("filename").value; //文件名
saveAs(
new BB(
["\ufeff" + contentStr] //\ufeff防止utf8 bom防止中文乱码
, { type: "text/plain;charset=utf8" }
) , fileNmae);
};
})();
</script>
</body>
</html>