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做作业

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function get_primes(arr) {    return arr.filter(function(x){        var a = x;        var c = 0;        for (var b = 2; b < a; b++) {            if (a % b !== 0) {                c++;            };        };        if(c === (a - 2)) {            return true;        }else {            return false;        }    });}

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