方法一（支持Chrome和Firefox）：
function download(filename, text) {
var pom = document.createElement('a');
pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
pom.setAttribute('download', filename);
if (document.createEvent) {
var event = document.createEvent('MouseEvents');
event.initEvent('click', true, true);
pom.dispatchEvent(event);
} else {
pom.click();
}
}
调用方式：
download("data.txt","hello world");
方法二（支持Chrome）：
function download(filename,content,contentType) {
if (!contentType) contentType = 'application/octet-stream';
var a = document.createElement('a');
var blob = new Blob([content], { 'type': contentType });
a.href = window.URL.createObjectURL(blob);
a.download = filename;
a.click();
}
调用方式：
download("data.txt,"hello world");
