js 上传下载excle文件

var wb;//读取完成的数据
var rABS = false; //是否将文件读取为二进制字符串
function fixdata(data) { //文件流转BinaryString
	var o = "",
		l = 0,
		w = 10240;
	for (; l < data.byteLength / w; ++l) o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)));
	o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)));
	return o;
}
$("#file").change(function () {
	if (!this.files) {
		return;
	}
	var f = this.files[0];
	var reader = new FileReader();
	reader.onload = function (e) {
		var data = e.target.result;
		if (rABS) {
			wb = XLSX.read(btoa(fixdata(data)), {
				type: 'base64'
			});
		} else {
			wb = XLSX.read(data, {
				type: 'binary'
			});
		}
		console.log(wb)
		// document.getElementById("demo").innerHTML = JSON.stringify(XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]));
	};
	if (rABS) {
		reader.readAsArrayBuffer(f);
	} else {
		reader.readAsBinaryString(f);
	}
})
// 导出excle数据
$('#btn').on('click', function() {
	var ws = XLSX.utils.json_to_sheet(users);/* 新建空workbook，然后加入worksheet */
	var wb = XLSX.utils.book_new();/*新建book*/
	XLSX.utils.book_append_sheet(wb, ws, "People");/* 生成xlsx文件(book,sheet数据,sheet命名) */
	XLSX.writeFile(wb, "sheetjs.xlsx");
})