为什么用document.write()编写<script>标记?
<script>
</script>
document.write()
<script type='text/javascript'> if (typeof window['jQuery'] == 'undefined') document.write('<scr'+'ipt type="text/javascript" src="http://z-ecx.images-amazon.com/images/G/01/javascripts/lib/jquery/jquery-1.2.6.pack._V265113567_.js"></sc'+'ript>');</script>
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