js检测dict中是否包含某个key 数组中是否含有某元素

Posted 2020-12-07 几许风雨

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");