摘要： “37”+7 //377“37”-7 //30巧用+/-规则变字符串x+''变数字x-0js里面的==是不严格等于“123” == 1230 == falsenul l== undefinednew Object() == new Object()[1,2]==[1,2]但是[1,2]===[1,2... 阅读全文