导入xls到页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>xls的导入</title>
</head>
<body>
    <label for="excel-file" class="btn btn-success">导入Excel文件</label>
<input type="file" name="excel-file" id="excel-file"/>
<br>
<table id="context">
 
</table>
</body>
</html>
<script src="./jquery.js"></script>
<script src="./xlsx.core.min.js"></script>
<script>
    $('#excel-file').change(function(e) {   
        console.log(e);        
            try {
                new Uint8Array([1,2]).slice(0,2);
            } catch (e) {
                console.log("[Uint8Array"+e.description+"]这里使用【Array.slice】。");
                //IE或有些浏览器不支持Uint8Array.slice()方法。改成使用Array.slice()方法
                Uint8Array.prototype.slice = Array.prototype.slice;
            }
            var url=$('#excel-file').val();
            if(!url){return;}
            var suffix=url.substring(url.lastIndexOf(".")+1,url.length);
            if(!(suffix=="xls"||suffix=="xlsx")){
                return alert("文件类型不正确");
            }
            var files = e.target.files;            
            var fileReader = new FileReader();
            fileReader.readAsArrayBuffer(files[0]);// 以二进制方式打开文件
            fileReader.onload = function(ev) {
                $('#excel-file').val('');
                $("#context").html("");
                try {                    
                    var data = ev.target.result;
                    var workbook = XLSX.read(data, { type: 'array'}),
                    persons = [];
                } catch (e) {
                    console.error(e);
                    return alert('文件类型不正确!');
                }
                
                //遍历每张表读取
                for (var sheet in workbook.Sheets) {
                    if (workbook.Sheets.hasOwnProperty(sheet)) {
                        persons = persons.concat(XLSX.utils.sheet_to_json(workbook.Sheets[sheet],{raw:true, header:1}));
                        console.log(persons)
                        for ( var i = 0; i <persons.length; i++){
                            var person=persons[i];
                            var tr='<tr id="tr-'+i+'">';
                            for (var j = 0; j <person.length; j++){
                                tr+='<td>'+$.trim(person[j]?person[j]:"")+'</td>';
                            }
                            for (var k = 0; k < (6-person.length); k++) {
                                tr+='<td></td>';
                            }
                            if(person.length>1){
                                tr+='<td style="padding:6px;"><a href="javascript:$(\'#tr-'+i+'\').remove();" class="btn btn-danger btn-xs">删除</a></td></tr>';
                                $("#context").append(tr);
                            }
                        }
                        break;// 如果只取第一张表，就把beak注释取消
                    }
                }
            };
        });
</script>