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// 递归 
function gcd(m ,n){
  if(n) return gcd(n,m%n);
  return m;
}

// 循环方法
function gcd(m ,n){
    var r = 0;
    do{
        r = m%n; m = n; n = r;
    }while(r!==0);
    return m;
}