错误信息：

// Hello.
//
// This is JSHint, a tool that helps to detect errors and potential
// problems in your JavaScript code.
//
// To start, simply enter some JavaScript anywhere on this page. Your
// report will appear on the right side.
//
// Additionally, you can toggle specific options in the Configure
// menu.

function main() {
  var nodes = [1,2,3,4,5,6,7,8,9,0];
  for(var i = 0, len = nodes.length; i < len; i++){
    console.info(nodes[i]);
  }
  eval('console.info(2);');
  return 'Hello, World!';
}

main();