我正在学习Javascript。有人可以告诉我我做得不对吗?javascript string to number = NaN
total = pdf_tp_summa+2490+(Number(elem_summa_sms.value))+(Number(elem_summa_push.value));
typeof(pdf_tp_summa) = number
typeof(elem_summa_sms.value) = string
typeof(elem_summa_push.value) = string
在数字中添加字符串是否可以用实际值替换字符串? –