概述:
1、Array.prototype.includes方法用来检测数组中是否包含某个元素,返回布尔类型值;语法:arr.includes(元素值);
2、指数操作符,功能与 Math.pow 结果相同;幂运算的简化写法,例如:2的10次方:2**10;
Array.prototype.includes代码示例:
<!DOCTYPE html><html><head><meta charset="utf-8"><title>includes</title></head><body><script>// includeslet arr = [1,2,3,4,5];console.log(arr.includes(1)); //true</script></body></html>
指数操作符代码示例:
<!DOCTYPE html><html><head><meta charset="utf-8"><title>指数操作符</title></head><body><script>// 指数操作符console.log(Math.pow(2,10)) // 1024console.log(2**10); //1024</script></body></html>