Quote the writing of the Script label closure when the external script

When quoting the external script, the correct closure of the Script tag is as follows:

Copy code code as follows:

<script type = "text/javascript" src = "js/a.js"> </script>

There are problems with self -closure writing (test IE11, Chrome 31.0, FF 25.0 do not support)::

Copy code code as follows:

<script type = "text/javascript" src = "js/a.js"/>