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<title>StripingTable</title>
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//隐藏和显示div层
function changeDisplay(){
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if(val=="隐藏"){
helloDivObj.hide();
buttonObj.attr("value","显示");
}else{
helloDivObj.show();
buttonObj.attr("value","隐藏");
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// var helloDivObj = $("#helloDiv").toggle(); //甚至只需要这一句搞定切换隐藏与显示
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<div class="title_a">一、JQuery核心库</div>
<div class="title_b">(一)、jQuery(e xpression,[context])用法!</div>
<div class="title_c">3.jQuery(elements)</div>
将一个或多个DOM元素转化为jQuery对象。这个函数也可以接收XML文档和Window对象（虽然它们不是DOM元素）作为有效的参数。<p></p>
<input id="btnDisplay" type="button" value="隐藏"
<div id="helloDiv">
Hello,everyone<p></p>
Hello,everytwo<p></p>
Hello,everythree<p></p>
</div>
</bdoy>
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