js obtain a list of pieces of data (Interface)

Data read:
 // server to verify Ajax

$ .ajax ({

    type:"post",
    url:"http://",
    data:{deviceid:1},
    dataType:'json',
    success : function(data) {
        var jsonText = data;
        var ab= eval("("+jsonText+")");//json格式转换
        for(j=0;j<ab.length;j++){
            $(ab[j]).each(
                function (i, values) {
                    $("#list").append(
                        "<tr class='ch_no'><td>" + i+1 + "</td>" +
                        "<td style=\"padding-left: 5%;\">"  + values.isReign + "</td>" +
                        "<td style=\"padding-left: 5%;\">"+ values.gain + "</td>" +
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"outputPower\">\n" +
                        "     <option selected=\"selected\">"+values.outputPower+"</option>\n" +
                        "</select>" +
                        "</td>" +
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"forwardLinkRate\">\n" +
                        "     <option selected=\"selected\">"+values.forwardLinkRate+"</option>\n" +
                        "</select>"+
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"reverseLinkRate\">\n" +
                        "      <option selected=\"selected\">"+values.reverseLinkRate+"</option>\n" +
                        "</select>" +
                        "</td>" +
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"forwardModType\">\n" +
                        "      <option selected=\"selected\">"+values.forwardModType+"</option>\n" +
                        "</select>" +
                        "</td>" +
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"reverseModType\">\n" +
                        "      <option selected=\"selected\">"+values.reverseModType+"</option>\n" +
                        "</select>" +
                        "</td>" +
                        "<td style=\"padding-left: 5%;\">" +
                        "<select id=\"outputRate\">\n" +
                        "      <option selected=\"selected\">"+values.outputRate+"</option>\n" +
                        "      <option>不限</option>" +
                        "</select>" +
                        "</td></tr>"
                    );
                }
            );
        }
    }
});

保存数据：
$("#btnSubmit").on('click',(function () {
    var ab = new Array();
    var ch_no = $('.ch_no');
    var aDiv=document.getElementsByClassName("ch_no");//获取文档中class为"ch_no"的所有元素

    for (var i = 0;i<aDiv.length;i++) {//遍历 aDiv的中所有元素并且将所有class为"ch_no"的元素保存到数组aerial

        var outputPower_con = $(ch_no[i]).find("#outputPower").find("option:selected").val();
        var forwardLinkRate_con = $(ch_no[i]).find("#forwardLinkRate").find("option:selected").val();
        var reverseLinkRate_con = $(ch_no[i]).find("#reverseLinkRate").find("option:selected").val();
        var forwardModType_con = $(ch_no[i]).find("#forwardModType").find("option:selected").val();
        var reverseModType_con = $(ch_no[i]).find("#reverseModType").find("option:selected").val();
        var outputRate_con = $(ch_no[i]).find("#outputRate").find("option:selected").val();
        aerial.push({
            outputPower: outputPower_con,
            forwardLinkRate: forwardLinkRate_con,
            reverseLinkRate: reverseLinkRate_con,
            forwardModType: forwardModType_con,
            reverseModType: reverseModType_con,
            outputRate: outputRate_con
        })
    }
    console.log(ab);
    $.ajax({
        url: "http://",//接口地址
        type:'post',
        data: ab,
        datatype: 'json',
        success : function(data) {
            console.log(data)
        },
        error : function() {
            alert('保存失败，请重试！ ');
        }
    })
})