Javascript连接数字，而不是加起来 [英] Javascript concatenating numbers, not adding up

问题描述

它一直将我的数字连接到2111而不是5.这是为什么？我尝试过使用parseInt但没有运气。 res3 btw表示我正在执行的数据库查询。

It keeps concatenating my numbers into 2111 instead of 5. Why is this? I've tried using parseInt with no luck. res3 btw represents a query into my database that I'm executing.

var dt_total_hours = 0;

            dt_total_hours += res3.fieldByName(dt_cost_per_hour);
            dt_total_hours += res3.fieldByName(dt_prod_dt_hours);
            dt_total_hours += res3.fieldByName(dt_prod_rate);
            dt_total_hours += res3.fieldByName(dt_cost_per_unit);
            dt_total_hours += res3.fieldByName(dt_scrap_startup_cost);
            dt_total_hours += res3.fieldByName(dt_labor_expense);
            dt_total_hours += res3.fieldByName(dt_since_issues_first_noticed);
            dt_total_hours += res3.fieldByName(dt_wo_for_maint);
            dt_total_hours += res3.fieldByName(dt_investigation);
            dt_total_hours += res3.fieldByName(dt_maint_made_bandaid);
            dt_total_hours += res3.fieldByName(dt_parts_outsourcing);
            dt_total_hours += res3.fieldByName(dt_get_equip_out_prod);
            dt_total_hours += res3.fieldByName(dt_perm_repair);
            dt_total_hours += res3.fieldByName(dt_equip_back_to_prod);
            dt_total_hours += res3.fieldByName(dt_to_full_prod_speed);
            dt_total_hours += res3.fieldByName(dt_other);

推荐答案

如果值是字符串，那么它们将被连接，没有以数字方式添加。

If the values are strings then they will be concatenated, not added numerically.

尝试从字符串值构造一个数字：

dt_total_hours += Number(res3.fieldByName(dt_cost_per_hour));
//                ^------ Force a number here instead of a string.

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