console.log("community_code:"+community_code);console.log("community_code!==undefined:"+(community_code!==undefined));console.log("community_code==undefined:"+(community_code==undefined));今天寫一段代碼發(fā)現(xiàn)邏輯不對，返回寫了這三句話打印出來，返現(xiàn)打印的結(jié)果如下：請問這是為什么呢？
值為undefined的變量和 undefined比較返回false？？
暮色呼如
2019-03-12 17:08:12
