纯前端利用 js-xlsx 实现 Excel 文件导入导出功能示例

╰半夏微凉° 2021-09-15 10:38 384阅读 0赞

#  #

# 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

代码实现(==>[示例][Link 1]<==)

<!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"οnchange="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

代码实现(==>[示例][Link 2]<==)

<!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 οnclick="downloadExl(jsono)">导出</button>
        
        <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>

备注:原文转自https://www.jianshu.com/p/74d405940305

[js-xlsx]: https://link.jianshu.com/?t=https%3A%2F%2Fgithub.com%2FSheetJS%2Fjs-xlsx
[Link 1]: https://link.jianshu.com/?t=http%3A%2F%2Frunjs.cn%2Fdetail%2Fp1bvlpjt
[Link 2]: https://link.jianshu.com/?t=http%3A%2F%2Frunjs.cn%2Fdetail%2Fhznwzc8j