https://dascript.org/
可以有两种风格：有花括号、没花括号
无括号
def fibR(n)
    if (n < 2)
        return n
    else
        return fibR(n - 1) + fibR(n - 2)
    
def fibI(n)
    var last = 0
    var cur = 1
    for i in range(0, n-1)
        let tmp = cur
        cur += last
        last = tmp
    return cur

有括号
def fibR(n) {
    if (n < 2) {
        return n;
    } else {
        return fibR(n - 1) + fibR(n - 2);
    }
}  
def fibI(n) {
    var last = 0;
    var cur = 1;
    for i in range(0, n-1); {
        let tmp = cur;
        cur += last;
        last = tmp;
    }
    return cur;
}
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FROM 171.106.20.*