如何创建具有“ a”重复“ b”次的数组

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I am trying to create a function that takes in two vairables a and b, this function will create an array with variable a reapeated b times.

这是我走了多远，但未在数组中输出正确数量的项目：

var createArr = function(a, b) {
    // returns an array with variable a repeated b times.
    if (typeof b == 'number') {
      var arr = [];

      for (var i = 0; i <= b; i++) {
        arr.push(a);
      };
    }
      return arr;
    };
    
 createArr("ready",3)