when I use 'document.getElementsByTagName("el")'  to get
collections.the collections  are 'undefined' in monitor,but 'length'
property exists

eg.

<script>
      var arr = document.getElementsByTagName('input');
      alert(arr);// arr are 'Object HTMLCollection'   but it shows in
monitor is 'undefined' , I cann't watch   //its children
      alert(arr.length > 0);  //true
</script>



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