<script tyep=text/javascript>
Array.prototype.map = function( fun ) {
      var arr = [];
      for (var i = 0; i < this.length; i ++) {
           arr.push( fun.call(this[i], i) );
      }
      return arr
}


alert([0, 1, 2, 3].map(function() {
      return this * 82 + (this > 1) * 8 + 10;
}))
</script>

------解决方案--------------------

当然是有规律的
JScript code
function foo(n) {
  var dict = [10, 12, 20, 12];
  var width = 70;
  if(n >= dict.length) n = dict.length - 1;
  var t = width * n;
  while(n >= 0) t += dict[n--];
  return t;
}

document.write(foo(0)+'<br>');//10
document.write(foo(1)+'<br>');//92
document.write(foo(2)+'<br>');//182
document.write(foo(3)+'<br>');//264