js random string regular method ([A~Z],[a~z],[0~9])

This time I will bring you the random string of jsregular method ([A~Z],[a~z],[0~9]), the random string regular method of js ( [A~Z],[a~z],[0~9])NotesWhat are the following? Let’s take a look at the actual cases.

function ranNum(l) {    return Math.floor(Math.random() * (l[1] - l[0])) + l[0];
}function r(len) {    var s = "",t;    for (; len > 0; len--) {
        t = ranNum([[65, 91], [97, 123],[0, 10] ][ranNum([0, 3])]);
        s = s + (t > 10 ? String.fromCharCode(t) : t.toString());
    }    return s;
}console.log("测试",r(10));

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