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<p class="intro">welcome to my web site </p>
<p>we sell all the widget you need </p>
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<div id="ku">
<p class="intro">welcome to my web site </p>
<p>we sell all the widget you need </p>
</div>

<p class="firstp">lglg </p>

<script language="javascript">

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for(i=0;i <els.length;i++){
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paragraphs[i].style.fontSize='2em';
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var elss=node.getElementsByTagName("*");
for(i=0;i <elss.length;i++){
if(elss[i].className==firstp) alert(elss[i].innerHTML);//ÕâÀïÒ²ÊÇ°¡
}

var qq="qq";
alert(qq);//¾ÍÁ¬×î¼òµ¥µÄalertҲû×÷ÓÃÁË ÕâÊÇΪʲôÄØ£¿
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