SheetJS---(js-xlsx)

xiaoxiao2021-02-28  20

SheetJS的使用(js-xlsx)

使用纯前端的方式实现对excel表格的读取和导出功能

github地址:https://github.com/SheetJS/js-xlsx

学习地址:https://www.jianshu.com/p/74d405940305

1.导入功能实现

下载js-xlsx到dist复制出xlsx.full.min.js引入到页面中 然后通过FileReader对象读取文件利用js-xlsx转成json数据

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script src="http://oss.sheetjs.com/js-xlsx/xlsx.full.min.js"></script> </head> <body> <input type="file"onchange="importf(this)" /> <div id="demo"></div> <script> /* FileReader共有4种读取方法: 1.readAsArrayBuffer(file):将文件读取为ArrayBuffer。 2.readAsBinaryString(file):将文件读取为二进制字符串 3.readAsDataURL(file):将文件读取为Data URL 4.readAsText(file, [encoding]):将文件读取为文本,encoding缺省值为'UTF-8' */ 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 importf(obj) {//导入 if(!obj.files) { return; } var f = obj.files[0]; var reader = new FileReader(); reader.onload = function(e) { var data = e.target.result; if(rABS) { wb = XLSX.read(btoa(fixdata(data)), {//手动转化 type: 'base64' }); } else { wb = XLSX.read(data, { type: 'binary' }); } //wb.SheetNames[0]是获取Sheets中第一个Sheet的名字 //wb.Sheets[Sheet名]获取第一个Sheet的数据 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); } } 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; } </script> </body> </html>

2.导出功能的实现

同样引入js-xlsx

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script src="http://oss.sheetjs.com/js-xlsx/xlsx.full.min.js"></script> </head> <body> <button onclick="downloadExl(jsono)">导出</button> <!-- 以下a标签不需要内容 --> <a href="" download="这里是下载的文件名.xlsx" id="hf"></a> <script> var jsono = [{ //测试数据 "保质期临期预警(天)": "adventLifecycle", "商品标题": "title", "建议零售价": "defaultPrice", "高(cm)": "height", "商品描述": "Description", "保质期禁售(天)": "lockupLifecycle", "商品名称": "skuName", "商品简介": "brief", "宽(cm)": "width", "阿达": "asdz", "货号": "goodsNo", "商品条码": "skuNo", "商品品牌": "brand", "净容积(cm^3)": "netVolume", "是否保质期管理": "isShelfLifeMgmt", "是否串号管理": "isSNMgmt", "商品颜色": "color", "尺码": "size", "是否批次管理": "isBatchMgmt", "商品编号": "skuCode", "商品简称": "shortName", "毛重(g)": "grossWeight", "长(cm)": "length", "英文名称": "englishName", "净重(g)": "netWeight", "商品分类": "categoryId", "这里超过了": 1111.0, "保质期(天)": "expDate" }]; var tmpDown; //导出的二进制对象 function downloadExl(json, type) { var tmpdata = json[0]; json.unshift({}); var keyMap = []; //获取keys //keyMap =Object.keys(json[0]); for (var k in tmpdata) { keyMap.push(k); json[0][k] = k; } var tmpdata = [];//用来保存转换好的json json.map((v, i) => keyMap.map((k, j) => Object.assign({}, { v: v[k], position: (j > 25 ? getCharCol(j) : String.fromCharCode(65 + j)) + (i + 1) }))).reduce((prev, next) => prev.concat(next)).forEach((v, i) => tmpdata[v.position] = { v: v.v }); var outputPos = Object.keys(tmpdata); //设置区域,比如表格从A1到D10 var tmpWB = { SheetNames: ['mySheet'], //保存的表标题 Sheets: { 'mySheet': Object.assign({}, tmpdata, //内容 { '!ref': outputPos[0] + ':' + outputPos[outputPos.length - 1] //设置填充区域 }) } }; tmpDown = new Blob([s2ab(XLSX.write(tmpWB, {bookType: (type == undefined ? 'xlsx':type),bookSST: false, type: 'binary'}//这里的数据是用来定义导出的格式类型 ))], { type: "" }); //创建二进制对象写入转换好的字节流 var href = URL.createObjectURL(tmpDown); //创建对象超链接 document.getElementById("hf").href = href; //绑定a标签 document.getElementById("hf").click(); //模拟点击实现下载 setTimeout(function() { //延时释放 URL.revokeObjectURL(tmpDown); //用URL.revokeObjectURL()来释放这个object URL }, 100); } function s2ab(s) { //字符串转字符流 var buf = new ArrayBuffer(s.length); var view = new Uint8Array(buf); for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF; return buf; } // 将指定的自然数转换为26进制表示。映射关系:[0-25] -> [A-Z]。 function getCharCol(n) { let temCol = '', s = '', m = 0 while (n > 0) { m = n % 26 + 1 s = String.fromCharCode(m + 64) + s n = (n - m) / 26 } return s } </script> </body> </html>
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