SheetJS---(js-xlsx)

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


<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


<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>
    
    <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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