Javascript .route（'/listpopvim'，methods=['POST'，'GET']）def listpopvim（）：#p_name=request.form['pName']；p_name='p15'p_dict1=[]对于加载中的p_p:p_dic

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.route（'/listpopvim'，methods=['POST'，'GET']）def listpopvim（）：#p_name=request.form['pName']；p_name='p15'p_dict1=[]对于加载中的p_p:p_dict2={'pop'：p['fq_name'][1]}pop_dict1.append（pop_dict2）返回json.dumps（p_dict1）请

编辑

您的问题以包含服务器端代码，将其作为注释添加是相当困难的。在python方面帮不上什么忙，但是既然您已经知道如何使用ajax，为什么不能将

p_name

数据重新ajax到flask服务器？

@app.route('/listpopvim', methods=['POST','GET'])
def listpopvim():
    #p_name=request.form['pName'];
    p_name='p15'
    p_dict1 = []
    for p in load_p:
       p_dict2={
         'pop': p['fq_name'][1]
        }
       #pop_dict1.append(pop_dict2)

    return json.dumps(p_dict1)

<div class="row">
     <div class="col-xs-4">
     <h6> P Name </h6>
     <select id="pSelId" name="pName"  class="form-control"> </option> </select>
     </div>

     <div class="col-xs-4">
     <h6> VIM </h6>
     <select id="pVim" name="pVim" class="form-control"> </select>
     </div>
</div>


<script>
getdata()
function getdata(){
              $.ajax({
                        url : '/listpv',
                        type : 'POST',
                        success: function(data){
                                var pretrun = JSON.parse(data);
                                console.log(data)
$( "select" ).change( displayVals );
        var options = "";
         for (var i = 0; i < pretrun.length; i++) {
           if (pretrun[i].pop){
                options += "<option>" + pretrun[i].pop + "</option>";
                      }
                } 
        $("#pSelId").html(options);
                        },
                        error: function(error){
                                console.log(error);
                        }
                });

}

function displayVals() {
        var singleValues = $( "#pSelId" ).val();
        console.log(singleValues) 
}
$( "#pSelId" ).change( displayVals );
displayVals();

</script>

@app.route('/listpopvim', methods=['POST','GET'])
def listpopvim():
p_name=request.form['pName'];
p_dict1 = []
for p in load_p:
    p_dict2={
        'pop': p['fq_name'][1]
    }
   #pop_dict1.append(pop_dict2)

return json.dumps(p_dict1)

<div class="row">
 <div class="col-xs-4">
 <h6> P Name </h6>
 <select id="pSelId" name="pName"  class="form-control"> </option> </select>
 </div>

 <div class="col-xs-4">
 <h6> VIM </h6>
 <select id="pVim" name="pVim" class="form-control"> </select>
 </div>
</div>

<script>
getdata()
function getdata(){
    $.ajax({
        url : '/listpv',
        type : 'POST',
        data : {pName : $("pSelId").val()},
        success: function(data){
            var pretrun = JSON.parse(data);
            console.log(data);
            $( "select" ).change( displayVals );
            var options = "";
            for (var i = 0; i < pretrun.length; i++) {
                if (pretrun[i].pop){
                    options += "<option>" + pretrun[i].pop + "</option>";
                }
            } 
            $("#pSelId").html(options);
        },
        error: function(error){
            console.log(error);
        }
    });
}
function displayVals() {
    var singleValues = $( "#pSelId" ).val();
    console.log(singleValues) 
}
$( "#pSelId" ).change( displayVals );
displayVals();

</script>

                     function getpop(){
                          $.ajax({
                                url : '/listpopvim',
                                type : 'GET',
                                success: function(data){
                                     var pop = JSON.parse(data);
                                     console.log(data)
                                    var options = "";
                                    for (var i = 0; i < pop.length; i++) {
                                            if (pop[i].pop){
                                                    options += "<option>" + pop[i].pop + "</option>";
                                                    }
                                            } 
                                            $("#popSelId").html(options);
                                    $( "select" ).change( displayVals );
                                  },
                                  error: function(error){
                                        console.log(error);
                                    }
                            });

            }

                    displayVals();
                    function displayVals() {
                            $.ajax({
                                    url: "/listpopvim",
                                    data: {pName: $( "#popSelId" ).val()},
                                    ContentType : 'application/json',
                                    dataType: "json",
                                    //data: JSON.stringify(singleValues),
                                    type:"POST",
                                    success : function(response) {
                                            //console.log(response)
                                            },
                                    error: function() {
                                            alert('Error occured');
                                            }
                                    });
                    }