js 导出cvs

        js_csv: {
            export_csv: function (data, name) {
                var uri = 'data:text/csv;charset=utf-8,\ufeff' + encodeURIComponent(data);
                var downloadLink = document.createElement('a');
                downloadLink.href = uri;
                downloadLink.download = (name + '.csv') || 'temp.csv';
                document.body.appendChild(downloadLink);
                downloadLink.click();
                document.body.removeChild(downloadLink);
            },
            export_table: function (selector, name, split, fn) {
                var self = this;
                if (document.querySelectorAll(selector).length == 0) {
                    alert('Selector "' + selector + '" not exists!');
                    return false;
                }
                split = split ? split : null;
                fn = fn ? fn : null;
                self.export_csv(self.get_table_data(selector, split, fn), name);
            },
            get_table_data: function (selector, split, fn) {
                var data = '';
                var startPosition = 0, endPosition = 0;
                if (split) {
                    startPosition = split[0];
                    endPosition = split[1];
                }
                if (fn) {
                    data = fn();
                } else {
                    document.querySelectorAll(selector + ' tr').forEach(function (t, i) {
                        var tmp = [];
                        t.querySelectorAll('th,td').forEach(function (e, tdi) {
                            if ((tdi >= startPosition && tdi <= endPosition && endPosition > 0) || (tdi >= startPosition && endPosition === 0)) {
                                tmp.push(e.innerText === 'ID'?'id':e.innerText.replace('\n', '')); // 单元格里含有多个html元素可能会获取到换行符
                            }
                        });
                        data += tmp.join(',') + '\n';
                    });
                }
                return data;
            }
        },