js判断字符是否存在数组中

//检测某个字符是否在此数组中
function isinarray(arr, str) {
    var teststr = ',' + arr.join(",") + ",";
    return teststr.indexof("," + str + ",") != -1 ;
}
var arr = ["101", "102", "103"];
console.log(isinarray(arr,"101"));//true

文章转自：https://blog.csdn.net/weixin_38052444/article/details/81805870