in_array() has the same function as in_array() in php
Js code
//Find element value in array
function in_array(v, a) {
var i;
for (i = 0; i < a.length; i++) {
if (v === a[i]) {
return i;
}
}
return -1;
} // 返回-1表示没找到，返回其他值表示找到的索
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
