js 不同浏览器的下载方式

var a = document.getElementById('downloader');

var csv_base = "test";

// BOM（文字化け対策）
var bom = new Uint8Array([0xEF, 0xBB, 0xBF]);

var blob = new Blob([bom, csv_base], {
type: 'text/csv'
});

// ie浏览器
if (window.ActiveXObject || "ActiveXObject" in window) {

window.navigator.msSaveOrOpenBlob(blob, "file_name");
} else {

var url = (window.URL || window.webkitURL).createObjectURL(blob);
a.download = "file_name";
a.href = url;
}