1、判断是否包含，当包含时返回true，不包含时返回false，代码实例如下：
let string = "123345";
let substring1 = "12";
let substring2 = "01";
string.includes(substring1); //true
string.includes(substring2); //false
2、下次再写原文：https://www.cnblogs.com/xiao-wu-gui/p/12172647.html