title: IE11,can't get the arguments of a function
body: <p>for example, like this function:</p>
  
  <pre><code>function foo(){
     console.log(arguments)
  }
  foo(1,2,3);
  </code></pre>
  
  <p>normally,we will get '[1,2,3]' in console,</p>
  
  <p>But at IE11 in win7,when we change the doc mode to IE7 ~ IE9,
  we just get 'undefind' instead.</p>
  
  <p>I want to know why? and how can I get the  The Unknown Quantity arguments?</p>