在JS中如何把毫秒转换成规定的日期时间格式实例

Date.prototype.toLocaleString = function() {
               return this.getFullYear() + "-" + (this.getMonth() + 1) + "-" + this.getDate() + " " + this.getHours() + ":" + this.getMinutes() + ":" + this.getSeconds();
            };

success:function(data){
          var Str="";  
          var length = data.length;
          for(var i=0;i<length;i++){  
             //Str += '<tr><td>'+data[i].roleId+'</td><td>'+data[i].roleName+'</td><td>'+data[i].remarks+'</td><td>'+data[i].createBy+'</td><td>'+data[i].createDate+'</td><td>'+data[i].updateBy+'</td><td>'+data[i].updateDate+'</td><td>'+data[i].status+'</td></tr>';
            Date.prototype.toLocaleString = function() {
               return this.getFullYear() + "-" + (this.getMonth() + 1) + "-" + this.getDate() + " " + this.getHours() + ":" + this.getMinutes() + ":" + this.getSeconds();
            };
            Str += "<tr>" +
             "<td class=\"tbody_check\">" +
              "<span class=\"check\">" +
                "<input type=\"checkbox\" value=\""+data[i].roleId+"\" name=\"checkbox\">" +
              "</span>" +
             "</td>" +
             "<td>" +data[i].roleId+"</td>" +
             "<td>" +data[i].roleName+"</td>" +
             "<td>" +data[i].remarks+"</td>" +
             "<td>" +data[i].createBy+"</td>" +
             "<td>" +new Date(data[i].createDate).toLocaleString()+"</td>" +
             "<td>" +data[i].updateBy+"</td>" +
             "<td>" +new Date(data[i].updateDate).toLocaleString()+"</td>" +
             "<td>" +data[i].status+"</td>" +
           "</tr>";
          }
          $("#rolelist").html(Str);
        }