java - ajax写好了，后台out.print();拿不到数据，给看看

Answer 1

out 中设置content-type为application/json
show_num(jsonb.counttest) 改为show_num(data.counttest)

Answer 2

function getdata(){
    var num = $("#cur_num").val();
    $.ajax({
        url: 'updateCountWx.action',
        type: 'POST',
        dataType: "json",
        data:{'total':num},
        cache: false,
        timeout: 10000,
        error: function(){},
        success: function(data){
            show_num(JSON.parse(data).counttest);
        }
       });
}

function show_num(n){
    var it = $(".t_num i");
    var len = String(n).length;
    for(var i=0;i<len;i++){
        if(it.length<=i){
            $(".t_num").append("<i></i>");
        }
        var num=String(n).charAt(i);
        var y = -parseInt(num)*30;
        var obj = $(".t_num i").eq(i);
        obj.animate({
            backgroundPosition :'(0 '+String(y)+'px)' 
            }, 'slow','swing',function(){}
        );
    }
    $("#cur_num").val(n);
}