csv是一种文本格式，有两个规则：
1. 一行就是一行以\n分割。
2. 一行之内以','分割1. node中处理不含汉字的字符串
var fs = require('fs');
const aaa = "name,age\nallen,29";
fs.writeFile('file.csv', aaa, function(err) {
if (err) throw err;
console.log('file saved');
});保存的结果：
2. node中处理包含汉字的字符串
var fs = require('fs');
const aaa = "name,age,家乡\nallen,29,河南";
fs.writeFile('file.csv', "\ufeff"+aaa, function(err) {
if (err) throw err;
console.log('file saved');
});结果:
3. 页面中处理非汉字
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="author" content="oscar999">
<title>
</title>
<script>
function clickDownload(aLink)
{
var str = "col1,col2,col3\nvalue1,value2,value3";
str = encodeURIComponent(str);
aLink.href = "data:text/csv;charset=utf-8,"+str;
aLink.click();
}
</script>
</head>
<body>
<a id="test" onclick="clickDownload(this)" download="downlaod.csv" href="#">download</a>
</body>
</html>4. 页面中处理汉字
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<meta name="author" content="oscar999">
<title>
</title>
<script>
function clickDownload(aLink)
{
var str = "栏位1,栏位2,栏位3\n值1,值2,值3";
str = encodeURIComponent(str);
aLink.href = "data:text/csv;charset=utf-8,\ufeff"+str;
aLink.click();
}
</script>
</head>
<body>
<a id="test" onclick="clickDownload(this)" download="downlaod.csv" href="#">download</a>
</body>
</html>
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