求大神优化前端js代码

Question

今天已经发过一个帖子了，因为最近发现自己的jsp文件打开后很卡，可能是因为js代码写的太垃圾了，主要就是ajax里面写的重复代码太多了，很感谢中午网友热心的帮我优化，下面这个是js拼接html代码的，感觉这样写太垃圾了，求大神优化下。。。

    //加载客户参课记录
    function loadcankejilu(){
        var content = '';
        $.ajax({
                cache: true,
                type: "POST",
                dataType:'json',
                url:'/hszx/queryCankejilu.do',
                data:{C_ID:$('#currentCID').val()},
                async: false,
                success: function(data) {
                            var content = ' <table class="table table-border table-bordered table-bg table-hover table-sort;">'
                                        +'              <tr>'
                                        +'                  <td colspan="7">'
                                        +'                      <input type = "button" class="btn btn-primary" value = "报名" onclick="baomingpre()"/>'
                                        +'                      <input type = "button" id="baoming" style="display: none"  data-toggle="modal" data-target="#myModal6"/>'
                                        +'                  </td>'
                                        +'              </tr>'
                                        +'              <tr>'
                                        +'                  <th colspan="7"></th>'
                                        +'              </tr>'
                                        +'              <tr>'
                                        +'                  <th>参课人</th>'
                                        +'                  <th>课程名称</th>'
                                        +'                  <th>开课地点</th>'
                                        +'                  <th>报名价格</th>'
                                        +'                  <th>开课时间</th>'
                                        +'                  <th>课程状态</th>'
                                        +'                  <th>报名来源</th>'
                                        +'              </tr>';
                    var dataObj = data;
                    $.each(dataObj,function(index,item){
                        content+='  <tr>'
                                +'      <td>'+item.ct_NAME+'</td>'
                                +'      <td>'+item.sp_NAME+'</td>'
                                +'      <td>'+item.sp_ADDRESS+'</td>'
                                +'      <td>'+item.cp_MONEY+'</td>'
                                +'      <td>'+item.sp_STIME+'</td>'
                                +'      <td>'+item.sp_STATE+'</td>'
                                +'      <td>'+item.si_SIGNSTATE+'</td>'
                                +'  </tr>';
                    })
                    if(dataObj==''){
                        content+='<tr style="height:100px"><td  style="text-align:center;height:100px;" colspan="7">无参课记录<td></tr>';
                    }
                    content+'</table>';
                    $('#ckjl').html(content);
                }
            });

Answer 1

  var content = ' <table class=

这个没办法优化了，除非你服务器端IO读取模板内容一起返回就不需在客户端拼接了$.each也没办法优化，因为你有顺序，你这个代码没有什么特别好优化的
可以订阅个列隐射，map，for下简化代码了

    function loadcankejilu() {
        var content = '';
        var fields = [{ n: '参课人', f: 'ct_NAME' }, { n: '课程名称', f: 'sp_NAME' }, { n: '开课地点', f: 'sp_ADDRESS' }, { n: '报名价格', f: 'cp_MONEY' }, { n: '开课时间', f: 'sp_STIME' }, { n: '课程状态', f: 'sp_STATE' }, { n: '报名来源', f: 'si_SIGNSTATE' }, ]
        $.ajax({
            cache: true,
            type: "POST",
            dataType: 'json',
            url: '/hszx/queryCankejilu.do',
            data: { C_ID: $('#currentCID').val() },
            async: false,
            success: function (data) {
                var content = ' <table class="table table-border table-bordered table-bg table-hover table-sort;">'
                            + '              <tr>'
                            + '                  <td colspan="7">'
                            + '                      <input type = "button" class="btn btn-primary" value = "报名" onclick="baomingpre()"/>'
                            + '                      <input type = "button" id="baoming" style="display: none"  data-toggle="modal" data-target="#myModal6"/>'
                            + '                  </td>'
                            + '              </tr>'
                            + '              <tr>'
                            + '                  <th colspan="7"></th>'
                            + '              </tr>'
                            + '              <tr>'
                            + $(fields).map(function () { return '<th>' + this.n + '</th>' }).get().join('')
                            + '              </tr>';
                if (data&&data.length)//不用再申明个dataobj，没必要
                    $.each(data, function (index, item) {
                        content += '  <tr>';
                        for (var i = 0; i < fields.length; i++) content += '<td>' + item[fields[i].f] + '</td>';
                        content += '  </tr>';
                    })
                else content += '<tr style="height:100px"><td  style="text-align:center;height:100px;" colspan="7">无参课记录<td></tr>';

                content + '</table>';
                $('#ckjl').html(content);
            }
        });
    }