dict
ary.hasOwnProperty(key)
https://blog.csdn.net/donggx/article/details/53373497?utm_source=blogxgwz8
list
https://www.cnblogs.com/zaijin-yang/p/12196811.html
array.includes(searcElement[,fromIndex])
此方法判断数组中是否存在某个值，如果存在返回true，否则返回false
var arr=[1,2,3,4];if(arr.includes(3)) console.log("存在");else console.log("不存在");原文：https://www.cnblogs.com/jxfy/p/13027024.html