jQuery发起Post请求

function postjson(url, data, callback){
    $.ajax({
        type: 'POST',
        url: url,
        data: JSON.stringify(data),
        dataType: "json",
        contentType: 'application/json',
        async:true,
        success: function(data){
            if(callback) {
                callback(0,data)
            }
        },
        error : function(){
            callback(1,"")
        },
      });
}