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How to export and import excel using js? How to import and export excel using js (pure code)

不言
不言Original
2018-08-13 17:23:3313825browse

The content of this article is about how to export and import excel using js? The method of importing and exporting excel using js (pure code) has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Export excel

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>js导出excel</title>
</head>
<body>
    <button onclick="downloadExl(jsono)">导出</button>
    <a href="" download="我是导出来的测试文件.xlsx" id="downloadA"></a>
    
    <script src="xlsx.full.min.js"></script>
    <script>
        var jsono = [{
			         	"姓名": "张三",
			         	"年龄": "30",
			         	"性别": "男"
			         },{
			         	"姓名": "李四",
			         	"年龄": "40",
			         	"性别": "女"
			         },{
			         	"姓名": "王五",
			         	"年龄": "50",
			         	"性别": "男"
			         }];
        var tmpDown; //导出的二进制对象
        function downloadExl(json, type) {
        	//根据json数据，获取excel的第一行(例如:姓名、年龄、性别)存至map
            var tmpdata = json[0];
            json.unshift({});
            var keyMap = []; //获取keys
            for (var k in tmpdata) {
                keyMap.push(k);
                json[0][k] = k;
            }
            
            
          	var tmpdata = [];
            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
            });
          	
          	//设置区域,比如表格从A1到D10
            var outputPos = Object.keys(tmpdata); 
            var tmpWB = {
                SheetNames: [&#39;mySheet&#39;], //保存的表标题
                Sheets: {
                    &#39;mySheet&#39;: Object.assign({},
                        tmpdata, //内容
                        {
                            &#39;!ref&#39;: outputPos[0] + &#39;:&#39; + outputPos[outputPos.length - 1] //设置填充区域
                        })
                }
            };
            
          	//创建二进制对象写入转换好的字节流
            tmpDown = new Blob([s2ab(XLSX.write(tmpWB, 
                {bookType: (type == undefined ? &#39;xlsx&#39;:type),bookSST: false, type: &#39;binary&#39;}//这里的数据是用来定义导出的格式类型
                ))], {
                type: ""
            });
          	
            var href = URL.createObjectURL(tmpDown); //创建对象超链接
            document.getElementById("downloadA").href = href; //绑定a标签
            document.getElementById("downloadA").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);
        }
 
      	//字符串转字符流
        function s2ab(s) { 
            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 = &#39;&#39;,
            s = &#39;&#39;,
            m = 0
            while (n > 0) {
                m = n % 26 + 1
                s = String.fromCharCode(m + 64) + s
                n = (n - m) / 26
            }
            return s
        }
    </script>
</body>
</html>

2. Export results

##3. Import excel

<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>js导入excel</title>
</head>
<body>
    <input type="file"onchange="importf(this)" />
    <p id="excelContent"></p>
    <script src="xlsx.full.min.js"></script>
    <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&#39;UTF-8&#39;
         */
        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

        //开始导入
        function importf(obj) {
            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: &#39;base64&#39;
                    });
                } else {
                    wb = XLSX.read(data, {
                        type: &#39;binary&#39;
                    });
                }
                /**
                 * 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
                 */
                var excelJson = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]);
                document.getElementById("excelContent").innerHTML= JSON.stringify( excelJson );
            };
            if(rABS) {
                reader.readAsArrayBuffer(f);
            } else {
                reader.readAsBinaryString(f);
            }
        }

        //文件流转BinaryString
        function fixdata(data) { 
            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>

4. Import Result

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