Head插入javascript及拼接

源码：

<script type="text/javascript">

//<![CDATA[

(function(){

var appid = ‘cyqU2kr6K‘;

var conf = ‘prod_5a7b238ba0f6502e5d6be14424b20ded‘;

var doc = document,

s = doc.createElement(‘script‘);

s.id = ‘changyan_mobile_js‘;

h = doc.getElementsByTagName(‘head‘)[0] || doc.head || doc.documentElement;

s.type = ‘text/javascript‘;

s.charset = ‘utf-8‘;

s.src = ‘http://changyan.sohu.com/upload/mobile/wap-js/changyan_mobile.js?client_id=‘+appid+‘&conf=‘+conf;

h.insertBefore(s,h.firstChild);

})();

//]]>

</script>

生成：

<script id="changyan_mobile_js" type="text/javascript" charset="utf-8" src="http://changyan.sohu.com/upload/mobile/wap-js/changyan_mobile.js?client_id=cyqU2kr6K&amp;conf=prod_5a7b238ba0f6502e5d6be14424b20ded"></script>

function trans(html){

var o = document.createElement(‘div‘),

t = document.createTextNode(html);

o.appendChild(t);

return o.innerHTML;

}

var txt = trans(‘<div><a href="">a<b>b</b>c</a></div>‘);

alert(txt)

这样可以直接给html转义