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  function getRandomString(length){
    var arr = [];
    for(var i = 0,l=30;i<l;i++){
      var cc = Math.floor(Math.random()*126);
      arr[i] = cc;
    }

    var randoms = arr.map(function(ele,i,a){
      if(ele >= 50) {
        return String.fromCharCode(ele);
      }
    });

    return randoms.join('').slice(0,length);
  }